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\n  \n 2024\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Exact Steering Bound for Two-Qubit Werner States.\n \n \n \n \n\n\n \n Zhang, Y.; and Chitambar, E.\n\n\n \n\n\n\n Physical Review Letters, 132(25). 6 2024.\n \n\n\n\n
\n\n\n\n \n \n \"ExactPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Exact Steering Bound for Two-Qubit Werner States},\n type = {article},\n year = {2024},\n volume = {132},\n month = {6},\n publisher = {American Physical Society},\n day = {21},\n id = {cbb1a39c-1255-37e1-a2b5-4f3751f0adc5},\n created = {2025-04-15T18:34:05.140Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:34:06.055Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Whether positive operator-valued measures (POVMs) provide advantages in demonstrating Bell nonlocality has remained unknown, even in the simple scenario of Einstein-Podolsky-Rosen steering with noisy singlet state, known as Werner states. Here we resolve this long-standing open problem by constructing a local hidden state model for Werner states with any visibility r≤1/2 under general POVMs, thereby closing the so-called Werner gap. This construction is based on an exact measurement compatibility model for the set of all noisy POVMs and also provides a local hidden variable model for a larger range of Werner states than previously known.},\n bibtype = {article},\n author = {Zhang, Yujie and Chitambar, Eric},\n doi = {10.1103/PhysRevLett.132.250201},\n journal = {Physical Review Letters},\n number = {25}\n}
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\n Whether positive operator-valued measures (POVMs) provide advantages in demonstrating Bell nonlocality has remained unknown, even in the simple scenario of Einstein-Podolsky-Rosen steering with noisy singlet state, known as Werner states. Here we resolve this long-standing open problem by constructing a local hidden state model for Werner states with any visibility r≤1/2 under general POVMs, thereby closing the so-called Werner gap. This construction is based on an exact measurement compatibility model for the set of all noisy POVMs and also provides a local hidden variable model for a larger range of Werner states than previously known.\n
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\n \n\n \n \n \n \n \n \n Incompatibility as a Resource for Programmable Quantum Instruments.\n \n \n \n \n\n\n \n Ji, K.; and Chitambar, E.\n\n\n \n\n\n\n PRX Quantum, 5(1). 1 2024.\n \n\n\n\n
\n\n\n\n \n \n \"IncompatibilityPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Incompatibility as a Resource for Programmable Quantum Instruments},\n type = {article},\n year = {2024},\n volume = {5},\n month = {1},\n publisher = {American Physical Society},\n day = {1},\n id = {ccec19cf-570e-342c-bdcc-e279a0479636},\n created = {2025-04-15T18:34:11.583Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:34:12.629Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Quantum instruments represent the most general type of quantum measurement, as they incorporate processes with both classical and quantum outputs. In many scenarios, it may be desirable to have some "on-demand"device that is capable of implementing one of many possible instruments whenever the experimenter desires. We refer to such objects as programmable instrument devices (PIDs), and this paper studies PIDs from a resource-theoretic perspective. A physically important class of PIDs are those that do not require quantum memories to implement, and these are naturally "free"in this resource theory. Additionally, these free objects correspond precisely to the class of unsteerable channel assemblages in the study of channel steering. The traditional notion of measurement incompatibility emerges as a resource in this theory since any PID controlling an incompatible family of instruments requires a quantum memory to build. We identify an incompatibility preorder between PIDs based on whether one can be transformed into another using processes that do not require additional quantum memories. Necessary and sufficient conditions are derived for when such transformations are possible based on how well certain guessing games can be played using a given PID. Ultimately our results provide an operational characterization of incompatibility, and they offer semi-device-independent tests for incompatibility in the most general types of quantum instruments.},\n bibtype = {article},\n author = {Ji, Kaiyuan and Chitambar, Eric},\n doi = {10.1103/PRXQuantum.5.010340},\n journal = {PRX Quantum},\n number = {1}\n}
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\n Quantum instruments represent the most general type of quantum measurement, as they incorporate processes with both classical and quantum outputs. In many scenarios, it may be desirable to have some \"on-demand\"device that is capable of implementing one of many possible instruments whenever the experimenter desires. We refer to such objects as programmable instrument devices (PIDs), and this paper studies PIDs from a resource-theoretic perspective. A physically important class of PIDs are those that do not require quantum memories to implement, and these are naturally \"free\"in this resource theory. Additionally, these free objects correspond precisely to the class of unsteerable channel assemblages in the study of channel steering. The traditional notion of measurement incompatibility emerges as a resource in this theory since any PID controlling an incompatible family of instruments requires a quantum memory to build. We identify an incompatibility preorder between PIDs based on whether one can be transformed into another using processes that do not require additional quantum memories. Necessary and sufficient conditions are derived for when such transformations are possible based on how well certain guessing games can be played using a given PID. Ultimately our results provide an operational characterization of incompatibility, and they offer semi-device-independent tests for incompatibility in the most general types of quantum instruments.\n
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\n \n\n \n \n \n \n \n \n Multipartite Nonlocality in Clifford Networks.\n \n \n \n \n\n\n \n Gatto Lamas, A.; and Chitambar, E.\n\n\n \n\n\n\n Physical Review Letters, 130(24). 6 2023.\n \n\n\n\n
\n\n\n\n \n \n \"MultipartitePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Multipartite Nonlocality in Clifford Networks},\n type = {article},\n year = {2023},\n volume = {130},\n month = {6},\n publisher = {American Physical Society},\n day = {16},\n id = {798d0ab3-ef2a-394e-89be-b08083dd43f9},\n created = {2025-04-15T18:34:17.640Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:34:18.551Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {We adopt a resource-theoretic framework to classify different types of quantum network nonlocality in terms of operational constraints placed on the network. One type of constraint limits the parties to perform local Clifford gates on pure stabilizer states, and we show that quantum network nonlocality cannot emerge in this setting. Yet, if the constraint is relaxed to allow for mixed stabilizer states, then network nonlocality can indeed be obtained. We additionally show that bipartite entanglement is sufficient for generating all forms of quantum network nonlocality when allowing for postselection, a property analogous to the universality of bipartite entanglement for generating all forms of multipartite entangled states.},\n bibtype = {article},\n author = {Gatto Lamas, Amanda and Chitambar, Eric},\n doi = {10.1103/PhysRevLett.130.240802},\n journal = {Physical Review Letters},\n number = {24}\n}
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\n We adopt a resource-theoretic framework to classify different types of quantum network nonlocality in terms of operational constraints placed on the network. One type of constraint limits the parties to perform local Clifford gates on pure stabilizer states, and we show that quantum network nonlocality cannot emerge in this setting. Yet, if the constraint is relaxed to allow for mixed stabilizer states, then network nonlocality can indeed be obtained. We additionally show that bipartite entanglement is sufficient for generating all forms of quantum network nonlocality when allowing for postselection, a property analogous to the universality of bipartite entanglement for generating all forms of multipartite entangled states.\n
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\n \n\n \n \n \n \n \n \n The Round Complexity of Local Operations and Classical Communication (LOCC) in Random-Party Entanglement Distillation.\n \n \n \n \n\n\n \n Liu, G.; George, I.; and Chitambar, E.\n\n\n \n\n\n\n Quantum, 7. 2023.\n \n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {The Round Complexity of Local Operations and Classical Communication (LOCC) in Random-Party Entanglement Distillation},\n type = {article},\n year = {2023},\n volume = {7},\n publisher = {Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften},\n id = {0c94bda5-b51e-36e0-9af1-2d24c01b8596},\n created = {2025-04-15T18:34:28.742Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:34:29.604Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {A powerful operational paradigm for distributed quantum information processing involves manipulating pre-shared entanglement by local operations and classical communication (LOCC). The LOCC round complexity of a given task describes how many rounds of classical communication are needed to complete the task. Despite some results separating one-round versus two-round protocols, very little is known about higher round complexities. In this paper, we revisit the task of one-shot random-party entanglement distillation as a way to highlight some interesting features of LOCC round complexity. We first show that for random-party distillation in three qubits, the number of communication rounds needed in an optimal protocol depends on the entanglement measure used; for the same fixed state some entanglement measures need only two rounds to maximize whereas others need an unbounded number of rounds. In doing so, we construct a family of LOCC instruments that require an unbounded number of rounds to implement. We then prove explicit tight lower bounds on the LOCC round number as a function of distillation success probability. Our calculations show that the original W-state random distillation protocol by Fortescue and Lo is essentially optimal in terms of round complexity.},\n bibtype = {article},\n author = {Liu, Guangkuo and George, Ian and Chitambar, Eric},\n doi = {10.22331/Q-2023-09-07-1104},\n journal = {Quantum}\n}
\n
\n\n\n
\n A powerful operational paradigm for distributed quantum information processing involves manipulating pre-shared entanglement by local operations and classical communication (LOCC). The LOCC round complexity of a given task describes how many rounds of classical communication are needed to complete the task. Despite some results separating one-round versus two-round protocols, very little is known about higher round complexities. In this paper, we revisit the task of one-shot random-party entanglement distillation as a way to highlight some interesting features of LOCC round complexity. We first show that for random-party distillation in three qubits, the number of communication rounds needed in an optimal protocol depends on the entanglement measure used; for the same fixed state some entanglement measures need only two rounds to maximize whereas others need an unbounded number of rounds. In doing so, we construct a family of LOCC instruments that require an unbounded number of rounds to implement. We then prove explicit tight lower bounds on the LOCC round number as a function of distillation success probability. Our calculations show that the original W-state random distillation protocol by Fortescue and Lo is essentially optimal in terms of round complexity.\n
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\n \n\n \n \n \n \n \n \n Entanglement Verification of Hyperentangled Photon Pairs.\n \n \n \n \n\n\n \n Zeitler, C., K.; Chapman, J., C.; Chitambar, E.; and Kwiat, P., G.\n\n\n \n\n\n\n Physical Review Applied, 18(5). 11 2022.\n \n\n\n\n
\n\n\n\n \n \n \"EntanglementPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Entanglement Verification of Hyperentangled Photon Pairs},\n type = {article},\n year = {2022},\n volume = {18},\n month = {11},\n publisher = {American Physical Society},\n day = {1},\n id = {5f54f362-f23b-391b-b45f-3ace04cb2185},\n created = {2025-04-15T18:35:55.153Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:35:56.040Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {We experimentally investigate the properties of hyperentangled states displaying simultaneous entanglement in multiple degrees of freedom and find that Bell tests beyond the standard Clauser-Horne-Shimony-Holt inequality can reveal a higher-dimensional nature in a device-independent way. Specifically, we show that hyperentangled states possess more than just simultaneous entanglement in separate degrees of freedom but also entanglement in a higher-dimensional Hilbert space. We also verify the steerability of hyperentangled quantum states by steering different photonic degrees of freedom.},\n bibtype = {article},\n author = {Zeitler, Christopher K. and Chapman, Joseph C. and Chitambar, Eric and Kwiat, Paul G.},\n doi = {10.1103/PhysRevApplied.18.054025},\n journal = {Physical Review Applied},\n number = {5}\n}
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\n We experimentally investigate the properties of hyperentangled states displaying simultaneous entanglement in multiple degrees of freedom and find that Bell tests beyond the standard Clauser-Horne-Shimony-Holt inequality can reveal a higher-dimensional nature in a device-independent way. Specifically, we show that hyperentangled states possess more than just simultaneous entanglement in separate degrees of freedom but also entanglement in a higher-dimensional Hilbert space. We also verify the steerability of hyperentangled quantum states by steering different photonic degrees of freedom.\n
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\n  \n 2021\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n Quantum Bell nonlocality as a form of entanglement.\n \n \n \n \n\n\n \n Chitambar, E.; Gour, G.; Sengupta, K.; and Zibakhsh, R.\n\n\n \n\n\n\n Physical Review A, 104(5). 11 2021.\n \n\n\n\n
\n\n\n\n \n \n \"QuantumPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Quantum Bell nonlocality as a form of entanglement},\n type = {article},\n year = {2021},\n volume = {104},\n month = {11},\n publisher = {American Physical Society},\n day = {1},\n id = {5d0be857-ba6a-3ff6-9bb3-441bc03ab9be},\n created = {2025-04-15T18:34:45.156Z},\n file_attached = {true},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:34:46.028Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Bell nonlocality describes a manifestation of quantum mechanics that cannot be explained by any local hidden variable model. Its origin lies in the nature of quantum entanglement, although understanding the precise relationship between nonlocality and entanglement has been a notorious open problem. In this paper, we develop a dynamical framework in which quantum Bell nonlocality emerges as a special form of entanglement and both are unified as resources under local operations and classical communication (LOCC). Our framework is built on the notion of classical and quantum processes, which are defined as channels that map elements between specific intervals in space and time. Entanglement is identified as a process that cannot be generated by LOCC while Bell nonlocality is the subset of these processes that have an instantaneous input-to-output delay time. LOCC preprocessing is a natural set of free operations in this theory, thereby providing previous nonlocality activation results a clear resource-theoretic foundation. We provide a systematic method to quantify the Bell nonlocality of a bipartite quantum channel. It is shown that both the relative entropy and the max relative entropy of nonlocality are nonadditive for a family of bipartite classical channels. This family includes the channel obtained when using the singlet state to maximally violate the CHSH inequality. We also find that the regularized relative entropy of Bell nonlocality provides an upper bound on the asymptotic rate of converting (i.e., simulating) many copies of one classical instantaneous resource to another.},\n bibtype = {article},\n author = {Chitambar, Eric and Gour, Gilad and Sengupta, Kuntal and Zibakhsh, Rana},\n doi = {10.1103/PhysRevA.104.052208},\n journal = {Physical Review A},\n number = {5}\n}
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\n Bell nonlocality describes a manifestation of quantum mechanics that cannot be explained by any local hidden variable model. Its origin lies in the nature of quantum entanglement, although understanding the precise relationship between nonlocality and entanglement has been a notorious open problem. In this paper, we develop a dynamical framework in which quantum Bell nonlocality emerges as a special form of entanglement and both are unified as resources under local operations and classical communication (LOCC). Our framework is built on the notion of classical and quantum processes, which are defined as channels that map elements between specific intervals in space and time. Entanglement is identified as a process that cannot be generated by LOCC while Bell nonlocality is the subset of these processes that have an instantaneous input-to-output delay time. LOCC preprocessing is a natural set of free operations in this theory, thereby providing previous nonlocality activation results a clear resource-theoretic foundation. We provide a systematic method to quantify the Bell nonlocality of a bipartite quantum channel. It is shown that both the relative entropy and the max relative entropy of nonlocality are nonadditive for a family of bipartite classical channels. This family includes the channel obtained when using the singlet state to maximally violate the CHSH inequality. We also find that the regularized relative entropy of Bell nonlocality provides an upper bound on the asymptotic rate of converting (i.e., simulating) many copies of one classical instantaneous resource to another.\n
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\n \n\n \n \n \n \n \n Quantum resource theories.\n \n \n \n\n\n \n Chitambar, E.; and Gour, G.\n\n\n \n\n\n\n Reviews of Modern Physics, 91(2). 2019.\n \n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 10 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Quantum resource theories},\n type = {article},\n year = {2019},\n volume = {91},\n id = {d34b5f84-32aa-3126-94f3-4294c9d7146f},\n created = {2025-04-15T18:33:49.802Z},\n file_attached = {false},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-15T18:33:49.802Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {© 2019 American Physical Society. Quantum resource theories (QRTs) offer a highly versatile and powerful framework for studying different phenomena in quantum physics. From quantum entanglement to quantum computation, resource theories can be used to quantify a desirable quantum effect, develop new protocols for its detection, and identify processes that optimize its use for a given application. Particularly, QRTs have revolutionized the way we think about familiar properties of physical systems such as entanglement, elevating them from being just interesting fundamental phenomena to being useful in performing practical tasks. The basic methodology of a general QRT involves partitioning all quantum states into two groups, one consisting of free states and the other consisting of resource states. Accompanying the set of free states is a collection of free quantum operations arising from natural restrictions placed on the physical system, restrictions that force the free operations to act invariantly on the set of free states. The QRT then studies what information processing tasks become possible using the restricted operations. Despite the large degree of freedom in how one defines the free states and free operations, unexpected similarities emerge among different QRTs in terms of resource measures and resource convertibility. As a result, objects that appear quite distinct on the surface, such as entanglement and quantum reference frames, appear to have great similarity on a deeper structural level. This article reviews the general framework of a quantum resource theory, focusing on common structural features, operational tasks, and resource measures. To illustrate these concepts, an overview is provided on some of the more commonly studied QRTs in the literature.},\n bibtype = {article},\n author = {Chitambar, E. and Gour, G.},\n doi = {10.1103/RevModPhys.91.025001},\n journal = {Reviews of Modern Physics},\n number = {2}\n}
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\n © 2019 American Physical Society. Quantum resource theories (QRTs) offer a highly versatile and powerful framework for studying different phenomena in quantum physics. From quantum entanglement to quantum computation, resource theories can be used to quantify a desirable quantum effect, develop new protocols for its detection, and identify processes that optimize its use for a given application. Particularly, QRTs have revolutionized the way we think about familiar properties of physical systems such as entanglement, elevating them from being just interesting fundamental phenomena to being useful in performing practical tasks. The basic methodology of a general QRT involves partitioning all quantum states into two groups, one consisting of free states and the other consisting of resource states. Accompanying the set of free states is a collection of free quantum operations arising from natural restrictions placed on the physical system, restrictions that force the free operations to act invariantly on the set of free states. The QRT then studies what information processing tasks become possible using the restricted operations. Despite the large degree of freedom in how one defines the free states and free operations, unexpected similarities emerge among different QRTs in terms of resource measures and resource convertibility. As a result, objects that appear quite distinct on the surface, such as entanglement and quantum reference frames, appear to have great similarity on a deeper structural level. This article reviews the general framework of a quantum resource theory, focusing on common structural features, operational tasks, and resource measures. To illustrate these concepts, an overview is provided on some of the more commonly studied QRTs in the literature.\n
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\n \n\n \n \n \n \n \n The Conditional Common Information in Classical and Quantum Secret Key Distillation.\n \n \n \n\n\n \n Chitambar, E.; Fortescue, B.; and Hsieh, M.\n\n\n \n\n\n\n IEEE Transactions on Information Theory, 64(11). 2018.\n \n\n\n\n
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@article{\n title = {The Conditional Common Information in Classical and Quantum Secret Key Distillation},\n type = {article},\n year = {2018},\n keywords = {Quantum cryptography,common information,quantum information,secret key distillation},\n volume = {64},\n id = {8417d685-cea4-3875-977d-aebed75ab139},\n created = {2025-04-12T18:22:28.298Z},\n file_attached = {false},\n profile_id = {889ca0d7-cd8b-3818-bafe-550deb56f3f0},\n group_id = {1c77b001-e142-3ae6-96e1-cdb934debae6},\n last_modified = {2025-04-12T18:22:28.298Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {© 2018 IEEE. In this paper, we consider two extensions of the Gács-Körner common information to three variables, the conditional common information (cCI) and the coarse-grained conditional common information (ccCI). Both quantities are shown to be useful technical tools in the study of classical and quantum resource transformations. In particular, the ccCI is shown to have an operational interpretation as the optimal rate of secret key extraction from an eavesdropped classical source pXYZ when Alice (X) and Bob (Y) are unable to communicate but share common randomness with the eavesdropper Eve (Z). Moving to the quantum setting, we consider two different ways of generating a tripartite quantum state from classical correlations pXYZ : 1) coherent encodings ∑xyz√pxyz|xyz〉 and 2) incoherent encodings ∑xyzpxyz|xyz〉〈xyz|. We study how well can Alice and Bob extract secret key from these quantum sources using quantum operations compared with the extraction of key from the underlying classical sources pXYZ using classical operations. While the power of quantum mechanics increases Alice and Bob's ability to generate shared randomness, it also equips Eve with a greater arsenal of eavesdropping attacks. Therefore, it is not obvious who gains the greatest advantage for distilling secret key when replacing a classical source with a quantum one. We first demonstrate that the classical key rate of pXYZ is equivalent to the quantum key rate for an incoherent quantum encoding of the distribution. For coherent encodings, we next show that the classical and quantum rates are generally incomparable, and in fact, their difference can be arbitrarily large in either direction. Finally, we introduce a "zoo" of entangled tripartite states all characterized by the conditional common information of their encoded probability distributions. Remarkably, for these states almost all entanglement measures, such as Alice and Bob's entanglement cost, squashed entanglement, and relative entropy of entanglement, can be sharply bounded or even exactly expressed in terms of the conditional common information. In the latter case, we thus present a rare instance in which the various entropic entanglement measures of a quantum state can be explicitly calculated.},\n bibtype = {article},\n author = {Chitambar, E. and Fortescue, B. and Hsieh, M.-H.},\n doi = {10.1109/TIT.2018.2851564},\n journal = {IEEE Transactions on Information Theory},\n number = {11}\n}
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\n © 2018 IEEE. In this paper, we consider two extensions of the Gács-Körner common information to three variables, the conditional common information (cCI) and the coarse-grained conditional common information (ccCI). Both quantities are shown to be useful technical tools in the study of classical and quantum resource transformations. In particular, the ccCI is shown to have an operational interpretation as the optimal rate of secret key extraction from an eavesdropped classical source pXYZ when Alice (X) and Bob (Y) are unable to communicate but share common randomness with the eavesdropper Eve (Z). Moving to the quantum setting, we consider two different ways of generating a tripartite quantum state from classical correlations pXYZ : 1) coherent encodings ∑xyz√pxyz|xyz〉 and 2) incoherent encodings ∑xyzpxyz|xyz〉〈xyz|. We study how well can Alice and Bob extract secret key from these quantum sources using quantum operations compared with the extraction of key from the underlying classical sources pXYZ using classical operations. While the power of quantum mechanics increases Alice and Bob's ability to generate shared randomness, it also equips Eve with a greater arsenal of eavesdropping attacks. Therefore, it is not obvious who gains the greatest advantage for distilling secret key when replacing a classical source with a quantum one. We first demonstrate that the classical key rate of pXYZ is equivalent to the quantum key rate for an incoherent quantum encoding of the distribution. For coherent encodings, we next show that the classical and quantum rates are generally incomparable, and in fact, their difference can be arbitrarily large in either direction. Finally, we introduce a \"zoo\" of entangled tripartite states all characterized by the conditional common information of their encoded probability distributions. Remarkably, for these states almost all entanglement measures, such as Alice and Bob's entanglement cost, squashed entanglement, and relative entropy of entanglement, can be sharply bounded or even exactly expressed in terms of the conditional common information. In the latter case, we thus present a rare instance in which the various entropic entanglement measures of a quantum state can be explicitly calculated.\n
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