Establishment of correlated pure states through decay in a squeezed reservoir

Ak, Ekert; Palma, G. Massimo; Sm, Barnett; Pl, Knight

doi:10.1103/physreva.39.6026

Cited by 31 publications

(13 citation statements)

References 16 publications

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“…In general, an excited QD is expected to decay to a mixed state characteristic of conventional thermodynamic equilibrium with the population distribution that obeys a Boltzmann distribution. The decay process can be modified and the nature of the equilibrium state could be different if the QD decays in a correlated reservoir, such as a squeezed vacuum [23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Establishment of correlated states in a quantum dot interacting with an acoustic-phonon reservoir

Huang

et al. 2014

Phys. Rev. A

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We investigate the effects of a low frequency (acoustic) phonon bath on the dynamics of a quantum dot modelled as a cascade three-level system. We show that the phonon bath appears to the upper transition of the cascade system as a broadband reservoir of inverted rather than conventional harmonic oscillators. The action of the annihilation and creation operators of the inverted oscillator are interchanges relative to those of the usual harmonic oscillator that it serves as a linear amplifier to the system, and thereby gives rise to unusual features in the dynamics of the quantum dot. We find that the phonon bath, although being in a thermal state, affects the quantum dot as a correlated-type reservoir which results in the decay of the system to a correlated two-photon state with the population distribution no longer obeying a Boltzmann distribution. It is particularly interesting that even for a zero temperature phonon reservoir the steady state is a correlated state which under appropriate conditions on the Rabi frequencies and the damping rates can reduce to a strongly correlated pure state. It is shown that the two-photon correlations result in a significant squeezing and strong two-photon correlations in the radiation field emitted by the quantum dot. The presence of the correlations in the system is manifest in the presence of quantum beats in the time evolution of the populations and the radiation intensity. The effect of the ordinary spontaneous emission on the features induced by the phonon bath is also discussed.

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Section: Introductionmentioning

confidence: 99%

Establishment of correlated states in a quantum dot interacting with an acoustic-phonon reservoir

Huang

et al. 2014

Phys. Rev. A

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“…Palma and Knight [1 ] considered a pair of correlated atoms interacting with a squeezed reservoir and pointed out that it is possible to establish a pure state which is far from the thermal equilibrium (see also [2,3]) . The pure state is called the two-atom squeezed state [4] .…”

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confidence: 98%

“…In this limit only the state I +) is populated, which means that the system is in a pure state . This state is known as the two-atom squeezed state [1][2][3][4] . Dynamics of generation of squeezed state 745 po two-photon correlations, characteristic of the squeezed vacuum, start to transfer the pulation from the state 11, -1) to the state I I 1, 1), without population of the state 1, 0) .…”

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confidence: 99%

Dynamics of the Generation of the Pure Two-atom Squeezed State

Wahiddin

Ficek

1995

Journal of Modern Optics

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“…whereK(η) is a unitary multimode squeezing transformation [4,5], which correlates symmetrical pairs of modes around the carrier frequency Ω…”

Section: A Four Level System Interacting With a Broadband Squeezed Vamentioning

confidence: 99%

Observable geometric phase induced by a cyclically evolving dissipative process

Carollo

Palma

2006

Laser Phys.

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In [1] a new way to generate an observable geometric phase on a quantum system by means of a completely incoherent phenomenon has been proposed. The basic idea is to force the ground state of the system to evolve ciclically by "adiabatically" manipulating the environment with which it interacts. The specific scheme analyzed in [1], consisting of a multilevel atom interacting with a broad-band squeezed vacuum bosonic bath whose squeezing parameters are smoothly changed in time along a closed loop, is here solved in a more direct way. This new solution emphasizes how the geometric phase on the ground state of the system is indeed due to a purely incoherent dynamics.

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Establishment of correlated pure states through decay in a squeezed reservoir

Cited by 31 publications

References 16 publications

Establishment of correlated states in a quantum dot interacting with an acoustic-phonon reservoir

Establishment of correlated states in a quantum dot interacting with an acoustic-phonon reservoir

Dynamics of the Generation of the Pure Two-atom Squeezed State

Observable geometric phase induced by a cyclically evolving dissipative process

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