Continuous variable entanglement enhancement and manipulation by a subthreshold Type II optical parametric amplifier

Shang, Yana; Jia, Xiaojun; Shen, Yu‐Mei; Xie, Changde; Peng, Kunchi

doi:10.1364/ol.35.000853

Cited by 23 publications

(16 citation statements)

References 15 publications

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“…These efforts focused on high-gain amplification of photonic states in nonlinear crystals to bootstrap multiphoton-state creation. In addition, optical parametric amplification has been considered for quantum cloning [11] and for the manipulation [12,13] of continuous-variable (CV) quantum states [14]. Other recent work suggests that OPSAs can be used as preamplifiers in CV quantum key distribution systems to increase detection efficiency [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Entangled-Pair Transmission Improvement Using Distributed Phase-Sensitive Amplification

Agarwal¹,

Dailey²,

Toliver³

et al. 2014

Phys. Rev. X

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We demonstrate the transmission of time-bin entangled photon pairs through a distributed optical phase-sensitive amplifier (OPSA). We utilize four-wave mixing at telecom wavelengths in a 5-km dispersion-shifted fiber OPSA operating in the low-gain limit. Measurements of two-photon interference curves show no statistically significant degradation in the fringe visibility at the output of the OPSA. In addition, coincidence counting rates are higher than direct passive transmission because of constructive interference between amplitudes of input photon pairs and those generated in the OPSA. Our results suggest that application of distributed phase-sensitive amplification to transmission of entangled photon pairs could be highly beneficial towards advancing the rate and scalability of future quantum communications systems.

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Section: Introductionmentioning

confidence: 99%

Entangled-Pair Transmission Improvement Using Distributed Phase-Sensitive Amplification

Agarwal¹,

Dailey²,

Toliver³

et al. 2014

Phys. Rev. X

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“…[16] for the tripartite entanglement generation from a single NOPO to the system of the cascaded NOPOs. Recently, two cascaded OPOs operating below the threshold have been successfully used for the manipulation of a squeezed vacuum and a two-mode entangled state [45,46]. The chaining technique of two OPOs applied in Refs.…”

Section: Discussionmentioning

confidence: 99%

“…The chaining technique of two OPOs applied in Refs. [45] and [46] can be easily transferred into the proposed protocol. We believe that by combining our proposal and schemes in Refs.…”

Section: Discussionmentioning

confidence: 99%

Bright three-color entangled state produced by cascaded optical parametric oscillators

2012

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We propose a generation system of continuous-variable (CV) three-color entangled state of bright optical beams based on two cascaded standard nondegenerate optical parametric oscillators (NOPOs) above the threshold. One of signal and idler beams produced by the first NOPO is used for the pump light of the second NOPO. The three-color entanglement among signal and idler beams produced by the second NOPO and the retained another beam of the first NOPO is theoretically demonstrated. The symplectic eigenvalues of the partial transposition covariance matrix of the generated optical entangled state are numerically calculated in terms of experimentally reachable system parameters. The optimal operation conditions of the cascaded NOPOs system for obtaining high entanglement are found. The calculated results explicitly demonstrate that the OPO action can transfer entanglement. Due to that the cavity parameters and the nonlinear crystals of the two NOPOs can be freely chosen, the flexibility of the proposed protocol is relatively good and the system can be also extended to prepare entangled states with more parts easily.

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“…G. S. Agarwal theoretically studied the interferences of the quantum fluctuations from a cavity driven by a quantized squeezed state of light 17 and then the quantum manipulation phenomenon was experimentally demonstrated by injecting a squeezed state of light into an optical cavity 18 . Successively, the phase-sensitive manipulation of entangled state of light was theoretically proposed and experimentally realized 19 20 21 . Because there is no measurement element in CFC, i.e.…”

mentioning

confidence: 99%

Quantum Coherent Feedback Control for Generation System of Optical Entangled State

Zhou

Jia

et al. 2015

Sci Rep

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The non-measurement based coherent feedback control (CFC) is a control method without introducing any backaction noise into the controlled system, thus is specially suitable to manipulate various quantum optical systems for preparing nonclassical states of light. By simply tuning the transmissivity of an optical controller in a CFC loop attached to a non-degenerate optical parametric amplifier (NOPA), the quantum entanglement degree of the output optical entangled state of the system is improved. At the same time, the threshold pump power of the NOPA is reduced also. The experimental results are in reasonable agreement with the theoretical expectation.

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Continuous variable entanglement enhancement and manipulation by a subthreshold Type II optical parametric amplifier

Cited by 23 publications

References 15 publications

Entangled-Pair Transmission Improvement Using Distributed Phase-Sensitive Amplification

Entangled-Pair Transmission Improvement Using Distributed Phase-Sensitive Amplification

Bright three-color entangled state produced by cascaded optical parametric oscillators

Quantum Coherent Feedback Control for Generation System of Optical Entangled State

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