Quantum mode filtering of non-Gaussian states for teleportation-based quantum information processing

Takeda, Shuntaro; Benichi, Hugo; Mizuta, Takahiro; Lee, Noriyuki; Yoshikawa, Jun–ichi; Furusawa, Akira

doi:10.1103/physreva.85.053824

Cited by 22 publications

(14 citation statements)

References 27 publications

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“…However, an actual experimental situation is typically more complex. For example, in single-mode CV teleportation experiments [6,7,[21][22][23][24], an input state is first attenuated (loss), next teleported, and finally attenuated again by the measurement (finite measurement efficiency); the overall channel thus should be written as three consecutive Gaussian channels. However, such a complex channel, composed of consecutive CV teleportation, pure attenuation, and amplification, can be described by only one input-output relation, similar to Eq.…”

Section: Epr Sourcementioning

confidence: 99%

Gain tuning for continuous-variable quantum teleportation of discrete-variable states

et al. 2013

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We present a general formalism to describe continuous-variable (CV) quantum teleportation of discrete-variable (DV) states with gain tuning, taking into account experimental imperfections. Here the teleportation output is given by independently transforming each density matrix element of the initial state. This formalism allows us to accurately model various teleportation experiments and to analyze the gain dependence of their respective figures of merit. We apply our formalism to the recent experiment of CV teleportation of qubits [S. Takeda et al., Nature 500, 315 (2013)] and investigate the optimal gain for the transfer fidelity. We also propose and model an experiment for CV teleportation of DV entanglement. It is shown that, provided the experimental losses are within a certain range, DV entanglement can be teleported for any non-zero squeezing by optimally tuning the gain.

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Section: Epr Sourcementioning

confidence: 99%

Gain tuning for continuous-variable quantum teleportation of discrete-variable states

et al. 2013

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“…In continuous variables, the photon-added and photon-subtracted actions to the multi-mode Gaussian and non-Gaussian states can enhance their nonclassicality, especially their entanglement property [19][20][21][22][23]. Besides, the non-Gaussian entangled states can provide the potential applications in quantum information as non-Gaussian entangled resources to perform the quantum tasks such as quantum teleportation [24][25][26], quantum steering [27], and quantum key distribution [28,29].…”

Section: Introductionmentioning

confidence: 99%

Detecting nonclassicality and non-Gaussianity by the Wigner function and quantum teleportation in photon-added-and-subtracted two modes pair coherent state

Đức

Tran

2021

J Comput Electron

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We introduce a new state called photon-added-and-subtracted two modes pair coherent state (PAASTMPCS) by simultaneously adding and subtracting photons to the different modes of a pair coherent state. Its nonclassical and non-Gaussian properties are strengthened via the negative values of its Wigner function as the numbers of adding and subtracting photons are increased. It indicates that the PAASTMPCS is an entangled state. When increasing the numbers of photon-added and photon-subtracted to a pair coherent state, the degree of entanglement in the PAASTMPCS is enhanced compared with the original pair coherent state. By using a PAASTM-PCS as a non-Gaussian entangled resource, the quantum teleportation processes are studied in detail. It is shown that the number sum and phase difference measurements protocol is more appropriate than the orthogonal quadrature components measurements protocol in the quantum teleportation process of a coherent state.

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“…In general, optical filtration before heralding-photon detection is useful, enabling engineering of the heralded wavepacket modes, and we note that optical high-pass filtering is utilized in previous experiments for preparation of cat states in order to avoid noisy low-frequencies, which are then utilized as input states of quantum teleportation system [24].…”

Section: Summary and Discussionmentioning

confidence: 99%

Purification of photon subtraction from continuous squeezed light by filtering

2017

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Photon subtraction from squeezed states is a powerful scheme to create good approximation of so-called Schrödinger cat states. However, conventional continuous-wave-based methods actually involve some impurity in squeezing of localized wavepackets, even in the ideal case of no optical losses. Here we theoretically discuss this impurity, by introducing mode-match of squeezing. Furthermore, here we propose a method to remove this impurity by filtering the photon-subtraction field. Our method in principle enables creation of pure photonsubtracted squeezed states, which was not possible with conventional methods.

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Quantum mode filtering of non-Gaussian states for teleportation-based quantum information processing

Cited by 22 publications

References 27 publications

Gain tuning for continuous-variable quantum teleportation of discrete-variable states

Gain tuning for continuous-variable quantum teleportation of discrete-variable states

Detecting nonclassicality and non-Gaussianity by the Wigner function and quantum teleportation in photon-added-and-subtracted two modes pair coherent state

Purification of photon subtraction from continuous squeezed light by filtering

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