@article{ciuti_quantum_2005,
	title = {Quantum vacuum properties of the intersubband cavity polariton field},
	volume = {72},
	url = {https://link.aps.org/doi/10.1103/PhysRevB.72.115303},
	doi = {10.1103/PhysRevB.72.115303},
	abstract = {We present a quantum description of a planar microcavity photon mode strongly coupled to a semiconductor intersubband transition in presence of a two-dimensional electron gas. We show that, in this kind of system, the vacuum Rabi frequency 𝛺𝑅 can be a significant fraction of the intersubband transition frequency 𝜔12. This regime of ultrastrong light-matter coupling is enhanced for long-wavelength transitions, because for a given doping density, effective mass and number of quantum wells, the ratio 𝛺𝑅/𝜔12 increases as the square root of the intersubband emission wavelength. We characterize the quantum properties of the ground state (a two-mode squeezed vacuum), which can be tuned in situ by changing the value of 𝛺𝑅, e.g., through an electrostatic gate. We finally point out how the tunability of the polariton quantum vacuum can be exploited to generate correlated photon pairs out of the vacuum via quantum electrodynamics phenomena reminiscent of the dynamical Casimir effect.},
	number = {11},
	urldate = {2025-03-07},
	journal = {Physical Review B},
	author = {Ciuti, Cristiano and Bastard, Gérald and Carusotto, Iacopo},
	month = sep,
	year = {2005},
	note = {Publisher: American Physical Society},
	keywords = {red},
	pages = {115303},
}

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