Wave-function engineering via conditional quantum teleportation with a non-Gaussian entanglement resource

Asavanant, Warit; Takase, Kan; Fukui, Kosuke; Endo, Mamoru; Yoshikawa, Jun–ichi; Furusawa, Akira

doi:10.1103/physreva.103.043701

Cited by 19 publications

(11 citation statements)

References 59 publications

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“…In the prepare-and-measure scheme, this corresponds to preparing the Fock state n j i with probability a n or b n for Alice and Bob, respectively. The states in the prepare-and-measure scheme can be engineered experimentally with several different methods such as conditional teleportation 48 , coherent displacements and photon subtraction 49 , and repeated parametric-down conversion 50 . Alternatively, these states can be created by extending the work presented in ref.…”

Section: Pnrd Alicementioning

confidence: 99%

Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol

et al. 2023

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Decoherence is detrimental to quantum key distribution (QKD) over large distances. One of the proposed solutions is to use quantum repeaters, which divide the total distance between the users into smaller segments to minimise the effects of the losses in the channel. Here we introduce a measurement-device-independent protocol which uses high-dimensional states prepared by two distant trusted parties and a coherent total photon number detection for the entanglement swapping measurement at the repeater station. We present an experimentally feasible protocol that can be implemented with current technology as the required states reduce down to the single-photon level over large distances. This protocol outperforms the existing measurement-device-independent and twin-field QKD protocols by achieving better key rates in general and higher transmission distance in total when experimental imperfections are considered. It also surpasses the fundamental limit of the repeaterless bound at a much shorter transmission distance in comparison to the existing TF-QKD protocols.

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Section: Pnrd Alicementioning

confidence: 99%

Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol

et al. 2023

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“…In fact, the locks did not drop for more than several days under normal laboratory conditions, and the system can be applied to experiments that require much longer measurement time. In more complicated non-Gaussian state generation, it is necessary to interfere multiple squeezed lights with beam splitters or to interfere with coherent lights called displacement beams [22,[45][46][47][48][49]. The proposed method can be easily extended to these cases.…”

Section: Photon Subtraction and Measurementmentioning

confidence: 99%

Non-Gaussian quantum state generation by multi-photon subtraction at the telecommunication wavelength

Endo¹,

He²,

Sonoyama³

et al. 2023

Preprint

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In the field of continuous-variable quantum information processing, non-Gaussian states with negative values of the Wigner function are crucial for the development of a faulttolerant universal quantum computer. While several non-Gaussian states have been generated experimentally, none have been created using ultrashort optical wave packets, which are necessary for high-speed quantum computation, in the telecommunication wavelength band where mature optical communication technology is available. In this paper, we present the generation of non-Gaussian states on wave packets with a short 8-ps duration in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three photons. We used a low-loss, quasi-single spatial mode waveguide optical parametric amplifier, a superconducting transition edge sensor, and a phase-locked pulsed homodyne measurement system to observe negative values of the Wigner function without loss correction up to three-photon subtraction. These results can be extended to the generation of more complicated non-Gaussian states and are a key technology in the pursuit of high-speed optical quantum computation.

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“…The next step is to turn the hybrid entangling coupling to the pulsed hybrid gate and test its performance. Pulsed operation brings a number of advantages, including working with modern tools of quantum optics [28] and, compared to a continuous-wave driving, a possibility to get rid of thermal decoherence by operating on shorter timescales. For the applications, it is advantageous to build a hybrid quantum nondemolition gate that allows to use geometric phase effects [29,30].…”

Section: Introductionmentioning

confidence: 99%

Atom-Mechanical Hong-Ou-Mandel Interference

Manukhova

Rakhubovsky

Filip

2022

Quantum

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Quantum coupling between mechanical oscillators and atomic gases generating entanglement has been recently experimentally demonstrated using their subsequent interaction with light. The next step is to build a hybrid atom-mechanical quantum gate showing bosonic interference effects of single quanta in the atoms and oscillators. We propose an experimental test of Hong-Ou-Mandel interference between single phononic excitation and single collective excitation of atoms using the optical connection between them. A single optical pulse is sufficient to build a hybrid quantum-nondemolition gate to observe the bunching of such different quanta. The output atomic-mechanical state exhibits a probability of a hybrid bunching effect that proves its nonclassical aspects. This proposal opens a feasible road to broadly test such advanced quantum bunching phenomena in a hybrid system with different specific couplings.

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Wave-function engineering via conditional quantum teleportation with a non-Gaussian entanglement resource

Cited by 19 publications

References 59 publications

Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol

Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol

Non-Gaussian quantum state generation by multi-photon subtraction at the telecommunication wavelength

Atom-Mechanical Hong-Ou-Mandel Interference

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