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\n  \n 2023\n \n \n (14)\n \n \n
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\n \n\n \n \n \n \n \n Building nanoscale engines with fully suspended carbon nanotubes.\n \n \n \n\n\n \n Ares, N.\n\n\n \n\n\n\n In Delft, Netherlands, 2023. \n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{ares_building_2023,\n\taddress = {Delft, Netherlands},\n\ttitle = {Building nanoscale engines with fully suspended carbon nanotubes},\n\tauthor = {Ares, Natalia},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Thermally driven quantum refrigerator autonomously resets superconducting qubit.\n \n \n \n\n\n \n Ali, A.\n\n\n \n\n\n\n In Singapore, 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{ali_thermally_2023,\n\taddress = {Singapore},\n\ttitle = {Thermally driven quantum refrigerator autonomously resets superconducting qubit},\n\tabstract = {The first thermal machines steered the industrial revolution, but their quantum analogs have yet to prove useful. Here, we demonstrate a useful quantum absorption refrigerator formed from superconducting circuits. We use it to reset a transmon qubit to a temperature lower than that achievable with any one available bath. The process is driven by a thermal gradient and is autonomous -- requires no external control. The refrigerator exploits an engineered three-body interaction between the target qubit and two auxiliary qudits coupled to thermal environments. The environments consist of microwave waveguides populated with synthesized thermal photons. The target qubit, if initially fully excited, reaches a steady-state excited-level population of 5×10−4±5×10−4 (an effective temperature of 23.5{\\textasciitilde}mK) in about 1.6{\\textasciitilde}μs. Our results epitomize how quantum thermal machines can be leveraged for quantum information-processing tasks. They also initiate a path toward experimental studies of quantum thermodynamics with superconducting circuits coupled to propagating thermal microwave fields.},\n\tauthor = {Ali, Aamir},\n\tyear = {2023},\n}\n\n
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\n The first thermal machines steered the industrial revolution, but their quantum analogs have yet to prove useful. Here, we demonstrate a useful quantum absorption refrigerator formed from superconducting circuits. We use it to reset a transmon qubit to a temperature lower than that achievable with any one available bath. The process is driven by a thermal gradient and is autonomous – requires no external control. The refrigerator exploits an engineered three-body interaction between the target qubit and two auxiliary qudits coupled to thermal environments. The environments consist of microwave waveguides populated with synthesized thermal photons. The target qubit, if initially fully excited, reaches a steady-state excited-level population of 5×10−4±5×10−4 (an effective temperature of 23.5~mK) in about 1.6~μs. Our results epitomize how quantum thermal machines can be leveraged for quantum information-processing tasks. They also initiate a path toward experimental studies of quantum thermodynamics with superconducting circuits coupled to propagating thermal microwave fields.\n
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\n \n\n \n \n \n \n \n Stochastic thermodynamics of a quantum dot coupled to a finite-size reservoir.\n \n \n \n\n\n \n Moreira, S. V.\n\n\n \n\n\n\n In Vienna, Austria, 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{moreira_stochastic_2023,\n\taddress = {Vienna, Austria},\n\ttitle = {Stochastic thermodynamics of a quantum dot coupled to a finite-size reservoir},\n\tabstract = {In nano-scale systems coupled to finite-size reservoirs, the reservoir temperature may fluctuate due to heat exchange between the system and the reservoirs. To date, a stochastic thermodynamic analysis of heat, work and entropy production in such systems is however missing. Here we fill this gap by analyzing a single-level quantum dot tunnel coupled to a finite-size electronic reservoir. The system dynamics is described by a Markovian master equation, depending on the fluctuating temperature of the reservoir. Based on a fluctuation theorem, we identify the appropriate entropy production that results in a thermodynamically consistent statistical description. We illustrate our results by analyzing the work production for a finite-size reservoir Szilard engine.},\n\tauthor = {Moreira, Saulo V.},\n\tyear = {2023},\n}\n\n
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\n In nano-scale systems coupled to finite-size reservoirs, the reservoir temperature may fluctuate due to heat exchange between the system and the reservoirs. To date, a stochastic thermodynamic analysis of heat, work and entropy production in such systems is however missing. Here we fill this gap by analyzing a single-level quantum dot tunnel coupled to a finite-size electronic reservoir. The system dynamics is described by a Markovian master equation, depending on the fluctuating temperature of the reservoir. Based on a fluctuation theorem, we identify the appropriate entropy production that results in a thermodynamically consistent statistical description. We illustrate our results by analyzing the work production for a finite-size reservoir Szilard engine.\n
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\n \n\n \n \n \n \n \n \n Quantum thermodynamics & precision measurement.\n \n \n \n \n\n\n \n Mitchison, M. T.\n\n\n \n\n\n\n In Santa Barbara, 2023. \n \n\n\n\n
\n\n\n\n \n \n \"QuantumPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{mitchison_quantum_2023,\n\taddress = {Santa Barbara},\n\ttitle = {Quantum thermodynamics \\& precision measurement},\n\turl = {https://online.kitp.ucsb.edu/online/qmetro23/mitchison/},\n\tauthor = {Mitchison, Mark T.},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Quantum absorption refrigerator based on 3-body interaction resets qubit autonomously.\n \n \n \n\n\n \n Ali, A.\n\n\n \n\n\n\n In Las Vegas, USA, 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{ali_quantum_2023,\n\taddress = {Las Vegas, USA},\n\ttitle = {Quantum absorption refrigerator based on 3-body interaction resets qubit autonomously},\n\tabstract = {Absorption refrigerators are autonomous machines that utilize the natural flow of heat in available thermal gradients to cool objects. Here, we present the realization of a quantum absorption refrigerator based on a three-body interaction in superconducting circuits. We demonstrate its operation by cooling a transmon qubit autonomously below its residual thermal occupation. Time-domain control can modulate the refrigerators's continuous operation to reset the qubit for quantum information processing. The refrigerator is fueled by an engineered two-photon process between three qubits. Its thermal baths are realized with coupled waveguides populated with microwave photons whose spectral density is synthesized to be thermal. We find that, under optimal operating conditions, the excited-state population of a fully excited qubit reaches the steady-state value 0.05\\% ± 0.05\\% in about 1.6 μs, in agreement with theoretical simulations. Our proof-of-concept refrigerator demonstrates that quantum thermal machines can be harnessed to perform useful tasks on quantum processing units. It also initiates a path to experimental studies of quantum thermodynamics using superconducting quantum circuits coupled to propagating thermal microwave fields.},\n\tauthor = {Ali, Aamir},\n\tyear = {2023},\n}\n\n
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\n Absorption refrigerators are autonomous machines that utilize the natural flow of heat in available thermal gradients to cool objects. Here, we present the realization of a quantum absorption refrigerator based on a three-body interaction in superconducting circuits. We demonstrate its operation by cooling a transmon qubit autonomously below its residual thermal occupation. Time-domain control can modulate the refrigerators's continuous operation to reset the qubit for quantum information processing. The refrigerator is fueled by an engineered two-photon process between three qubits. Its thermal baths are realized with coupled waveguides populated with microwave photons whose spectral density is synthesized to be thermal. We find that, under optimal operating conditions, the excited-state population of a fully excited qubit reaches the steady-state value 0.05% ± 0.05% in about 1.6 μs, in agreement with theoretical simulations. Our proof-of-concept refrigerator demonstrates that quantum thermal machines can be harnessed to perform useful tasks on quantum processing units. It also initiates a path to experimental studies of quantum thermodynamics using superconducting quantum circuits coupled to propagating thermal microwave fields.\n
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\n \n\n \n \n \n \n \n Fundamental accuracy-resolution trade-off for timekeeping devices.\n \n \n \n\n\n \n Meier, F.\n\n\n \n\n\n\n In Ireland, 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{meier_fundamental_2023,\n\taddress = {Ireland},\n\ttitle = {Fundamental accuracy-resolution trade-off for timekeeping devices},\n\tabstract = {From a thermodynamic point of view, all clocks are driven by irreversible processes. Additionally, one can use oscillatory systems to temporally modulate the thermodynamic flux towards equilibrium. Focusing on the most elementary thermalization events, this modulation can be thought of as a temporal probability concentration for these events. There are two fundamental factors limiting the performance of clocks: On the one level, the inevitable drifts of the oscillatory system, which are addressed by finding stable atomic or nuclear transitions that lead to astounding precision of today's clocks. On the other level, there is the intrinsically stochastic nature of the irreversible events upon which the clock's operation is based. This becomes relevant when seeking to maximize a clock's resolution at high accuracy, which is ultimately limited by the number of such stochastic events per reference time unit. We address this essential trade-off between clock accuracy and resolution, proving a universal bound for all clocks whose elementary thermalization events are memoryless.},\n\tauthor = {Meier, Florian},\n\tyear = {2023},\n}\n\n
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\n From a thermodynamic point of view, all clocks are driven by irreversible processes. Additionally, one can use oscillatory systems to temporally modulate the thermodynamic flux towards equilibrium. Focusing on the most elementary thermalization events, this modulation can be thought of as a temporal probability concentration for these events. There are two fundamental factors limiting the performance of clocks: On the one level, the inevitable drifts of the oscillatory system, which are addressed by finding stable atomic or nuclear transitions that lead to astounding precision of today's clocks. On the other level, there is the intrinsically stochastic nature of the irreversible events upon which the clock's operation is based. This becomes relevant when seeking to maximize a clock's resolution at high accuracy, which is ultimately limited by the number of such stochastic events per reference time unit. We address this essential trade-off between clock accuracy and resolution, proving a universal bound for all clocks whose elementary thermalization events are memoryless.\n
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\n \n\n \n \n \n \n \n Energy-Consumption Advantage of Quantum Computation.\n \n \n \n\n\n \n Meier, F.\n\n\n \n\n\n\n In 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{meier_energy-consumption_2023,\n\ttitle = {Energy-{Consumption} {Advantage} of {Quantum} {Computation}},\n\tabstract = {Energy consumption in solving computational problems has been gaining growing attention as a part of the performance measures of computers. Quantum computation is known to offer advantages over classical computation in terms of various computational resources; however, its advantage in energy consumption has been challenging to analyze due to the lack of a theoretical foundation to relate the physical notion of energy and the computer-scientific notion of complexity for quantum computation with finite computational resources. To bridge this gap, we introduce a general framework for studying the energy consumption of quantum and classical computation based on a computational model that has been conventionally used for studying query complexity in computational complexity theory. With this framework, we derive an upper bound for the achievable energy consumption of quantum computation. We also develop techniques for proving a nonzero lower bound of energy consumption of classical computation based on the energy-conservation law and Landauer's principle. With these general bounds, we rigorously prove that quantum computation achieves an exponential energy-consumption advantage over classical computation for solving a specific computational problem, Simon's problem. Furthermore, we clarify how to demonstrate this energy-consumption advantage of quantum computation in an experimental setting. These results provide a fundamental framework and techniques to explore the physical meaning of quantum advantage in the query-complexity setting based on energy consumption, opening an alternative way to study the advantages of quantum computation.},\n\tauthor = {Meier, Florian},\n\tyear = {2023},\n}\n\n
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\n Energy consumption in solving computational problems has been gaining growing attention as a part of the performance measures of computers. Quantum computation is known to offer advantages over classical computation in terms of various computational resources; however, its advantage in energy consumption has been challenging to analyze due to the lack of a theoretical foundation to relate the physical notion of energy and the computer-scientific notion of complexity for quantum computation with finite computational resources. To bridge this gap, we introduce a general framework for studying the energy consumption of quantum and classical computation based on a computational model that has been conventionally used for studying query complexity in computational complexity theory. With this framework, we derive an upper bound for the achievable energy consumption of quantum computation. We also develop techniques for proving a nonzero lower bound of energy consumption of classical computation based on the energy-conservation law and Landauer's principle. With these general bounds, we rigorously prove that quantum computation achieves an exponential energy-consumption advantage over classical computation for solving a specific computational problem, Simon's problem. Furthermore, we clarify how to demonstrate this energy-consumption advantage of quantum computation in an experimental setting. These results provide a fundamental framework and techniques to explore the physical meaning of quantum advantage in the query-complexity setting based on energy consumption, opening an alternative way to study the advantages of quantum computation.\n
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\n \n\n \n \n \n \n \n Electrically controlled spin mechanical coupling in a carbon nanotube resonator.\n \n \n \n\n\n \n Fedele, F.\n\n\n \n\n\n\n In Las Vegas, USA, 2023. \n \n\n\n\n
\n\n\n\n \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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@inproceedings{fedele_electrically_2023,\n\taddress = {Las Vegas, USA},\n\ttitle = {Electrically controlled spin mechanical coupling in a carbon nanotube resonator},\n\tabstract = {Coupling of a quantum system like a single spin to a mechanical resonator has many interesting applications in classical and quantum information processing, as well as sensing, long-distance spin-spin coupling, and investigating motion at the quantum limit.\n\nWe report on the first realization of spin mechanical coupling on a fully suspended carbon nanotube resonator.\n\nStrong spin-orbit interaction allows both the coherent manipulation of a single electron spin and mediates the coupling between the spin and the nanotube motion. We observe both resonant and off-resonant coupling, as a shift and broadening of the electron dipole spin-resonance (EDSR)-frequency, respectively. \n\nWe develop a complete theoretical model that matches the experimental data and provides a detailed understanding of the complex mechanisms at play. Our results demonstrate the potential of hybrid semiconductor circuits for applications requiring both mechanical and electric degrees of freedom on chip.},\n\tauthor = {Fedele, Federico},\n\tyear = {2023},\n}\n\n
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\n Coupling of a quantum system like a single spin to a mechanical resonator has many interesting applications in classical and quantum information processing, as well as sensing, long-distance spin-spin coupling, and investigating motion at the quantum limit. We report on the first realization of spin mechanical coupling on a fully suspended carbon nanotube resonator. Strong spin-orbit interaction allows both the coherent manipulation of a single electron spin and mediates the coupling between the spin and the nanotube motion. We observe both resonant and off-resonant coupling, as a shift and broadening of the electron dipole spin-resonance (EDSR)-frequency, respectively. We develop a complete theoretical model that matches the experimental data and provides a detailed understanding of the complex mechanisms at play. Our results demonstrate the potential of hybrid semiconductor circuits for applications requiring both mechanical and electric degrees of freedom on chip.\n
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\n \n\n \n \n \n \n \n Small and Cold, quantum revolutions in the realm of nanoscale physics.\n \n \n \n\n\n \n Fedele, F.\n\n\n \n\n\n\n In London, UK, 2023. \n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{fedele_small_2023,\n\taddress = {London, UK},\n\ttitle = {Small and {Cold}, quantum revolutions in the realm of nanoscale physics},\n\tauthor = {Fedele, Federico},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n What is a clock?.\n \n \n \n\n\n \n Erker, P.\n\n\n \n\n\n\n In Newport, USA, 2023. \n \n\n\n\n
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@inproceedings{erker_what_2023,\n\taddress = {Newport, USA},\n\ttitle = {What is a clock?},\n\tauthor = {Erker, Paul},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Waveguide quantum thermodynamics.\n \n \n \n\n\n \n Ali, A.\n\n\n \n\n\n\n In Tanumstrand, Sweden, 2023. \n \n\n\n\n
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@inproceedings{ali_waveguide_2023,\n\taddress = {Tanumstrand, Sweden},\n\ttitle = {Waveguide quantum thermodynamics},\n\tauthor = {Ali, Aamir},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Quantum devices for thermodynamics at the nanoscale.\n \n \n \n\n\n \n Ares, N.\n\n\n \n\n\n\n In Salamanca, Spain, 2023. \n \n\n\n\n
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@inproceedings{ares_quantum_2023,\n\taddress = {Salamanca, Spain},\n\ttitle = {Quantum devices for thermodynamics at the nanoscale},\n\tauthor = {Ares, Natalia},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Effects of Strong Coupling on Thermodynamic Uncertainty Relation.\n \n \n \n\n\n \n Mahadeviya, K.\n\n\n \n\n\n\n In Hyytiälä, Finland, 2023. \n \n\n\n\n
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@inproceedings{mahadeviya_effects_2023,\n\taddress = {Hyytiälä, Finland},\n\ttitle = {Effects of {Strong} {Coupling} on {Thermodynamic} {Uncertainty} {Relation}},\n\tauthor = {Mahadeviya, Khalak},\n\tyear = {2023},\n}\n\n
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\n \n\n \n \n \n \n \n Autonomous, thermally driven reset of a superconducting qubit based on a quantum absorption refrigerator.\n \n \n \n\n\n \n Gasparinetti, S.\n\n\n \n\n\n\n In Vienna, Austria, 2023. \n \n\n\n\n
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@inproceedings{gasparinetti_autonomous_2023,\n\taddress = {Vienna, Austria},\n\ttitle = {Autonomous, thermally driven reset of a superconducting qubit based on a quantum absorption refrigerator},\n\tauthor = {Gasparinetti, Simone},\n\tyear = {2023},\n}\n
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