Quantum non-Gaussian Depth of Single-Photon States

Straka, Ivo; Predojević, Ana; Huber, Tobias; Lachman, Lukáš; Butschek, Lorenz; Miková, Martina; Mičuda, Michal; Solomon, Glenn S.; Weihs, Gregor; Ježek, Miroslav; Filip, Radim

doi:10.1103/physrevlett.113.223603

Cited by 67 publications

(67 citation statements)

References 33 publications

(58 reference statements)

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“…Wigner function negativity is a distinguishing property of all pure quantum non-Gaussian (QNG) states [46], including ideal single-photon states. However, while a strongly attenuated field is necessarily non-negative in the Wigner representation, QNG remains an unambiguous and efficient test of higher-order quantum behavior even for mixed or attenuated states [47]. Indeed, QNG is a sufficient condition for security in realistic models of discrete-variable QKD networks [48].…”

Section: Introductionmentioning

confidence: 99%

Pure single photons from a trapped atom source

et al. 2016

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Single atoms or atom-like emitters are the purest source of single photons, they are intrinsically incapable of multi-photon emission. To demonstrate this degree of photon number-state purity we have realized a single-photon source using a single ion trapped at the common focus of high numerical aperture lenses. Our trapped-ion source produces single-photon pulses with = ´g 0 1.9 0.2 10 2 3 ( ) ( ) without any background subtraction. After subtracting detector dark counts the residual g 0 2 ( ) is less than 3×10 −4 (95% confidence interval). The multi-photon component of the source light field is low enough that we measure violation of a quantum non-Gaussian state witness, by this characterization the source output is indistinguishable from ideal attenuated single photons. In combination with efforts to enhance collection efficiency from single emitters, our results suggest that single trapped ions are not only ideal stationary qubits for quantum information processing, but promising sources of light for scalable optical quantum networks.

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Section: Introductionmentioning

confidence: 99%

Pure single photons from a trapped atom source

et al. 2016

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“…Quantum dots can emit single photons [1][2][3] as well as entangled photon pairs [4][5][6][7]. These photons and photon pairs are required for various quantum-enhanced tasks including linear optics quantum computation [8], quantum communication [9], and quantum sensing [10].…”

Section: Introductionmentioning

confidence: 99%

Optimal excitation conditions for indistinguishable photons from quantum dots

et al. 2015

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Keywords: quantum dots, quantum description of interaction of light and matter, related experiments, photoluminescence of III-V semiconductors AbstractIn this paper, we present a detailed, all optical study of the influence of different excitation schemes on the indistinguishability of single photons from a single InAs quantum dot. For this study, we measure the Hong-Ou-Mandel interference of consecutive photons from the spontaneous emission of an InAs quantum dot state under various excitation schemes and different excitation conditions and give a comparison. OPEN ACCESS RECEIVED

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“…is the Wigner function of the single squeezed Gaussian state given by equation (13). When we substitute the expression for W sG , equation (36), together with the Weyl-Wigner symbol given by equation (11)…”

Section: Near-optimal Non-gaussian States: Superposition Of Two Squeementioning

confidence: 99%

“…This approach was further developed to identify the non-Gaussianity of a noisy single-photon state including multi-mode contributions to the signal as well, which requires detection of two output-photons without resolving photon numbers after a beam-splitting operation. This technique was experimentally realized to demonstrate quantum non-Gaussianity of an imperfect single-photon state possessing even a positive Wigner function [12] and to study the resilience of quantum non-Gaussianity under dissipation [13]. Moreover, [14] introduced an experimental criterion to identify quantum non-Gaussianity of multi-photon states of light.…”

Section: Introductionmentioning

confidence: 99%

Sufficient condition for a quantum state to be genuinely quantum non-Gaussian

et al. 2018

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The following errors was introduced during the production process. In section 1.3. Outline the final two sentences should be interchanged and read 'In appendix C we derive the asymptotic behavior of the maximum mean value F sG =F sG (c) for the coherent superposition of two squeezed Gaussian states. We conclude in appendix D by describing the model of the dissipation of a quantum state via interaction with a reservoir at zero temperature.' instead of 'We conclude in appendix D by describing the model of the dissipation of a quantum state via interaction with a reservoir at zero temperature. In appendix C we derive the asymptotic behavior of the maximum mean value F sG =F sG (c) for the coherent superposition of two squeezed Gaussian states.' Also, reference [14] has an error in the year of publication. It should read 'Straka I, Lachman L, Hloušek J, Miková M, Mičuda M, Ježek M and Filip R 2018 npj Quantum Inf. 4 4' not 'Straka I, Lachman L, Hloušek J, Miková M, Mičuda M, Ježek M and Filip R 2016 npj Quantum Inf. 4 4'.

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Quantum non-Gaussian Depth of Single-Photon States

Cited by 67 publications

References 33 publications

Pure single photons from a trapped atom source

Pure single photons from a trapped atom source

Optimal excitation conditions for indistinguishable photons from quantum dots

Sufficient condition for a quantum state to be genuinely quantum non-Gaussian

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