Generation of highly pure Schrödinger’s cat states and real-time quadrature measurements via optical filtering

Asavanant, Warit; Nakashima, Kota; Shiozawa, Yu; Yoshikawa, Jun–ichi; Furusawa, Akira

doi:10.1364/oe.25.032227

Cited by 57 publications

(36 citation statements)

References 44 publications

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“…The sin-sideband mode has 99.9% fidelity to the lossy squeezed state since it is untouched by the subtraction. There are no extra factors that limit the purity in our method than the conventional photon subtraction; the major imperfection is the detection efficiency which is relatively low compared to the baseband experiments [36]. Our work can be compared with the recent works by Averchenko et al [37] and Ra et al [38], where they suggest and demonstrate pulse shaping of photon subtractors by means of gate pulses and frequency up-conversion.…”

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confidence: 76%

Generation of a Cat State in an Optical Sideband

et al. 2018

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We propose a method to subtract a photon from a double sideband mode of continuous-wave light. The central idea is to use phase modulation as a frequency sideband beamsplitter in the heralding photon subtraction scheme, where a small portion of the sideband mode is downconverted to 0 Hz to provide a trigger photon. An optical cat state is created by applying the proposed method to a squeezed state at 500MHz sideband, which is generated by an optical parametric oscillator. The Wigner function of the cat state reconstructed from a direct homodyne measurement of the 500 MHz sideband modes shows the negativity of W(0, 0) = −0.088 ± 0.001 without any loss corrections.

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confidence: 76%

Generation of a Cat State in an Optical Sideband

et al. 2018

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“…More recently however, there have been a multitude of experimental procedures undertaken to produce optical cat states. One such method is via photon subtraction of an optical squeezed state [ 45 – 50 ]; this method is usually suitable for producing low-amplitude cat states, which in fact is more applicable to this work, as we show in our results that cat states of amplitude 1.0 < | α | < 2.5 yield the best fidelity for our proposed protocol. A further proposed method is given in [ 51 ], in which squeezed cat states are shown to be generated from Fock states, via use of a single homodyne detector.…”

Section: The Entanglement Swapping Protocolmentioning

confidence: 99%

Photonic hybrid state entanglement swapping using cat state superpositions

Parker

Joo²,

Spiller

2020

Proc. R. Soc. A.

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We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state super- position) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5 -- 10 km , when used with a suitable entanglement purification scheme.

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“…A squeezed vacuum is also a quantum resource in continuous-variable quantum information processing [5]. Several quantum states such as a Schrödinger-cat-like state [6,7] or a cluster state [8] are created from squeezed vacua. A squeezed vacuum is also essential in quantum information processing such as quantum nondemolition gate [9] and one-way quantum computation [10].…”

Section: Introductionmentioning

confidence: 99%

Generation and measurement of a squeezed vacuum up to 100 MHz at 1550 nm with a semi-monolithic optical parametric oscillator designed towards direct coupling with waveguide modules

et al. 2019

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We report generation and measurement of a squeezed vacuum from a semimonolithic Fabry-Pérot optical parametric oscillator (OPO) up to 100 MHz at 1550 nm. The output coupler of the OPO is a flat surface of a nonlinear crystal with partially reflecting coating, which enables direct coupling with waveguide modules. Using the OPO, we observed 6.2dB of squeezing at 2 MHz and 3.0 dB of squeezing at 100 MHz. The OPO operates at the optimal wavelength to minimize propagation losses in silica waveguides and looks towards solving a bottleneck of downsizing these experiments: that of coupling between a squeezer and a waveguide.

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Generation of highly pure Schrödinger’s cat states and real-time quadrature measurements via optical filtering

Cited by 57 publications

References 44 publications

Generation of a Cat State in an Optical Sideband

Generation of a Cat State in an Optical Sideband

Photonic hybrid state entanglement swapping using cat state superpositions

Generation and measurement of a squeezed vacuum up to 100 MHz at 1550 nm with a semi-monolithic optical parametric oscillator designed towards direct coupling with waveguide modules

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