Non-Gaussian operation based on photon subtraction using a photon-number-resolving detector at a telecommunications wavelength

Namekata, Naoto; Takahashi, Y.; Fujii, Go; Fukuda, Daiji; Kurimura, Sunao; Inoue, Shuichiro

doi:10.1038/nphoton.2010.158

Cited by 106 publications

(80 citation statements)

References 25 publications

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“…We found the fidelity between the prepared state and the ideal CSQ, (|α − |−α )/ √ N − , is maximized for α = 0.75 and reaches a value of F −α = 0.65 ± 0.04. The nonclassicality of the superposition state produced by the Hadamard gate can be seen from the negativity of the corresponding Wigner function, which is W (0,0) = −0.11 ± 0.02, which is comparable to previous experiments where photon subtraction has been used to prepare non-Gaussian states [9][10][11][12][13][14][15]. The nonclassical effects were also observable without correction, with a fidelity of F −α = 0.55 ± 0.04 and a value at the origin of W (0,0) = −0.05 ± 0.02.…”

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confidence: 70%

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Experimental demonstration of a Hadamard gate for coherent state qubits

et al. 2011

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We discuss and experimentally demonstrate a probabilistic Hadamard gate for coherent state qubits. The scheme is based on linear optical components, non-classical resources and the joint projective action of a photon counter and a homodyne detector. We experimentally characterize the gate for the coherent states of the computational basis by full tomographic reconstruction of the transformed output states. Based on the parameters of the experiment we simulate the fidelity for all coherent state qubits on the Bloch sphere

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supporting

confidence: 70%

“…A Hadamard gate transforms the computational basis states |± α into the diagonal basis states (|α ± |−α )/ √ N ± , which we refer to as the even and odd coherent state qubits (CSQs) [8][9][10][11][12][13][14][15]. Such a transformation can be performed probabilistically using the circuit shown in Fig.…”

mentioning

confidence: 99%

Experimental demonstration of a Hadamard gate for coherent state qubits

et al. 2011

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“…It should be outlined that the measurement operator can be carried out by using photon number-resolving detectors (PNRDs) [49]. In the case of using avalanche photodiodes (APDs), they do not distinguish between one or several photons impinging on it at the same time, so the "click" event projects the state into a statistical mixture.…”

Section: Device Operationmentioning

confidence: 99%

Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices

2017

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Abstract:A quantum photonic circuit with the ability to produce continuous variable quantum vortex states is proposed. This device produces two single-mode squeezed states which go through a Mach-Zehnder interferometer where photons are subtracted by means of weakly coupled directional couplers towards ancillary waveguides. The detection of a number of photons in these modes heralds the production of a quantum vortex. Likewise, a measurement system of the order and handedness of quantum vortices is introduced and the performance of both devices is analyzed in a realistic scenario by means of the Wigner function. These devices open the possibility of using the quantum vortices as carriers of quantum information.

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“…An optical parametric amplifier enables us to create nonclassical photons in the setup of quantum optics (e.g., a squeezed vacuum state (SVS)) [14][15][16][17]. In particular, the scheme of subtracting photons has been theoretically proposed to achieve the approximated SCSs with high fidelity [18][19][20] and has been experimentally realized with the moderate size of its amplitude in the optical SCSs [16,[21][22][23]. It is known that the SCSs with a sufficiently large amplitude are utilized for fault-tolerant continuous-variable QI processing [24].…”

Section: Introductionmentioning

confidence: 99%

Implementation of Traveling Odd Schrödinger Cat States in Circuit-QED

2016

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Abstract:We propose a realistic scheme of generating a traveling odd Schrödinger cat state and a generalized entangled coherent state in circuit quantum electrodynamics (circuit-QED). A squeezed vacuum state is used as the initial resource of nonclassical states, which can be created through a Josephson traveling-wave parametric amplifier, and travels through a transmission line. Because a single-photon subtraction from the squeezed vacuum gives an odd Schrödinger cat state with very high fidelity, we consider a specific circuit-QED setup consisting of the Josephson amplifier creating the traveling resource in a line, a beam-splitter coupling two transmission lines, and a single photon detector located at the end of the other line. When a single microwave photon is detected by measuring the excited state of a superconducting qubit in the detector, a heralded cat state is generated with high fidelity in the opposite line. For example, we show that the high fidelity of the outcome with the ideal cat state can be achieved with appropriate squeezing parameters theoretically. As its extended setup, we suggest that generalized entangled coherent states can be also built probabilistically and that they are useful for microwave quantum information processing for error-correctable qudits in circuit-QED.

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Non-Gaussian operation based on photon subtraction using a photon-number-resolving detector at a telecommunications wavelength

Cited by 106 publications

References 25 publications

Experimental demonstration of a Hadamard gate for coherent state qubits

Experimental demonstration of a Hadamard gate for coherent state qubits

Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices

Implementation of Traveling Odd Schrödinger Cat States in Circuit-QED

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