Entangled coherent states created by mixing squeezed vacuum and coherent light

Israel, Yonatan; Cohen, Lior; Song, Xin-Bing; Joo, Jaewoo; Eisenberg, Henryk; Silberberg, Yaron

doi:10.1364/optica.6.000753

Cited by 32 publications

(16 citation statements)

References 40 publications

(57 reference statements)

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“…1. Since Caves found the effects of vacuum fluctuation to the phase accuracy in Mach-Zehnder interferometers [25], various types of input states have been discussed, including squeezed state [25][26][27][28], NOON state [29][30][31], entangled coherent state [32][33][34][35][36][37][38], BAT state [39], and number squeezed state [40].…”

Section: Introductionmentioning

confidence: 99%

Maximal quantum Fisher information for phase estimation without initial parity

Xu¹,

Zhao²,

Shen³

et al. 2018

Opt. Express

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Mach-Zehnder interferometer is a common device in quantum phase estimation and the photon losses in it are an important issue for achieving a high phase accuracy. Here we thoroughly discuss the precision limit of the phase in the Mach-Zehnder interferometer with a coherent state and a superposition of coherent states as input states. By providing a general analytical expression of quantum Fisher information, the phase-matching condition and optimal initial parity are given. Especially, in the photon loss scenario, the sensitivity behaviors are analyzed and specific strategies are provided to restore the phase accuracies for symmetric and asymmetric losses.

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Section: Introductionmentioning

confidence: 99%

Maximal quantum Fisher information for phase estimation without initial parity

Xu¹,

Zhao²,

Shen³

et al. 2018

Opt. Express

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show abstract

“…As a final remark, coherent states and entangled coherent states, including their generalization, can potentially be utilized in the quantum information processing technique [37][38][39]. Hence, characterizing and elucidating coherent states with their related phenomena, as well as the robust schemes for generating them, are important.…”

Section: Discussionmentioning

confidence: 99%

Quantum Behavior of a Nonextensive Oscillatory Dissipative System in the Coherent State

Choi

2021

Symmetry

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We investigate the nonextensivity of a generalized dissipative oscillatory system in the Glauber coherent state. We introduce a parameter q as a measure of the nonextensivity of the system. Considering the characteristic of nonextensivity, the system is described by a deformed Caldirola–Kanai oscillator, which is represented in terms of q. We manage the system by describing the associated Hamiltonian in terms of the harmonic oscillator ladder operators. The time evolutions of the canonical variables, the Hamiltonian expectation value, the quantum energy, and the symmetry-breaking in the evolution of the system, are analyzed in detail regarding their dependence on q, damping factor, and the external driving force. The amplitude of the oscillator is slightly quenched as q becomes large, whereas the amplitude of the canonical momentum is enhanced in response to the growth in q. As q increases, the dissipation of the quantum energy becomes a little faster as a manifestation of the nonextensivity of the system. Our results are compared to the classical results, as well as to those in the previous research performed on the basis of the SU(1,1) coherent states. The coherent states, including the Glauber coherent states, can be convenient resources for carrying information, which is crucial in quantum information processing.

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“…Again, light is absorbed or transmitted with 50% probability. In a third example, we consider 'asymmetric' illumination of the absorber by coherent |𝛼〉 𝑘 and Schrödinger cat |𝛼〉 −𝑘 + |−𝛼〉 −𝑘 states [91]. The first BS-transformation results in the entangled state of the standing waves…”

Section: Cpa Of Other CV Statesmentioning

confidence: 99%

Coherent perfect absorption of quantum light

Vetlugin

2021

Phys. Rev. A

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Coherent perfect absorption (CPA) was introduced as a classical optics phenomenon of a standing wave absorption by a subwavelength film. In this paper, we develop a theory of CPA of quantized standing waves taking account of a subwavelength thickness of the absorber. This approach allows us to merge all known quantum effects of CPA under a single theory and introduce new regimes of CPA including CPA of NOON states with arbitrary number of entangled photons, orthogonally squeezed vacuum states, continuous variable entangled states and Schrödinger cat states. Detailed analysis of quantum regime of CPA sheds light on fundamental aspects of quantum light dissipation and its practical implementation in quantum optics and quantum information.

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Entangled coherent states created by mixing squeezed vacuum and coherent light

Cited by 32 publications

References 40 publications

Maximal quantum Fisher information for phase estimation without initial parity

Maximal quantum Fisher information for phase estimation without initial parity

Quantum Behavior of a Nonextensive Oscillatory Dissipative System in the Coherent State

Coherent perfect absorption of quantum light

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