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Dias, Johnny Ferraz; Ryckbosch, D.; Vyver, R. Van de; Abeele, C. Van den; Meyer, G. De; Hoorebeke, Luc Van; Adler, J.-O.; Blomqvist, K. I.; Nilsson, Daniel; Ruijter, H.; Schroeder, B.

doi:10.1103/physrevc.55.942

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…In quantum information [1][2][3][4][5][6][7][8][9], the area of quantum and private communications is the subject of an intense theoretical study, also driven by an increasing number of experimental implementations. This hectic field ranges from point-to-point protocols to the development of quantum repeaters [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59], untrusted relays [60][61][62][63] and, more generally, a quantum network or quantum Internet [64][65][66][67][68]. In this wide scenario, it is important to know the fundamental limits imposed by quantum mechanics, which also serve as benchmarks to test the performance of practical proposals and new technologies.…”

Section: Introductionmentioning

confidence: 99%

Theory of channel simulation and bounds for private communication

Pirandola

Braunstein

Laurenza

et al. 2018

Quantum Sci. Technol.

140

177

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We review recent results on the simulation of quantum channels, the reduction of adaptive protocols (teleportation stretching), and the derivation of converse bounds for quantum and private communication, as established in PLOB [Pirandola, Laurenza, Ottaviani, Banchi, arXiv:1510.08863]. We start by introducing a general weak converse bound for private communication based on the relative entropy of entanglement. We discuss how combining this bound with channel simulation and teleportation stretching, PLOB established the two-way quantum and private capacities of several fundamental channels, including the bosonic lossy channel. We then provide a rigorous proof of the strong converse property of these bounds by adopting a correct use of the Braunstein-Kimble teleportation protocol for the simulation of bosonic Gaussian channels. This analysis provides a full justification of claims presented in the follow-up paper WTB [Wilde, Tomamichel, Berta, arXiv:1602.08898] whose upper bounds for Gaussian channels would be otherwise infinitely large. Besides clarifying contributions in the area of channel simulation and protocol reduction, we also present some generalizations of the tools to other entanglement measures and novel results on the maximum excess noise which is tolerable in quantum key distribution.

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Section: Introductionmentioning

confidence: 99%

Theory of channel simulation and bounds for private communication

Pirandola

Braunstein

Laurenza

et al. 2018

Quantum Sci. Technol.

140

177

View full text Add to dashboard Cite

show abstract

“…As seen in earlier, however, the utility of our distributed sensor for CV-QKD will be severely limited if the low transmissivity of long fiber connections cannot be mitigated. Toward that end, continuous-variable entanglement distillation [32][33][34][35] and quantum repeaters [36,37], once implemented, can accomplish that mitigation.…”

Section: Applicationsmentioning

confidence: 99%

Distributed Quantum Sensing Using Continuous-Variable Multipartite Entanglement

Zhuang

Zhang

Shapiro

2018

Conference on Lasers and Electro-Optics

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Distributed quantum sensing uses quantum correlations between multiple sensors to enhance the measurement of unknown parameters beyond the limits of unentangled systems. We describe a sensing scheme that uses continuous-variable multipartite entanglement to enhance distributed sensing of field-quadrature displacement. By dividing a squeezed-vacuum state between multiple homodyne-sensor nodes using a lossless beam-splitter array, we obtain a root-mean-square (rms) estimation error that scales inversely with the number of nodes (Heisenberg scaling), whereas the rms error of a distributed sensor that does not exploit entanglement is inversely proportional to the square root of the number of nodes (standard quantum limit scaling). Our sensor's scaling advantage is destroyed by loss, but it nevertheless retains an rms-error advantage in settings in which there is moderate loss. Our distributed sensing scheme can be used to calibrate continuous-variable quantum key distribution networks, to perform multiple-sensor cold-atom temperature measurements, and to do distributed interferometric phase sensing.

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“…Due to these properties, Gaussian QI has wide application to various fields [4]. These include quantum communication [8][9][10][11], quantum cryptography [12,13], quantum computation [14], quantum teleportation [15], quantum state and channel discrimination [16], and quantum metrology [18]. Of particular importance here is that change of relativistic reference frames preserve Gaussian states.…”

Section: Introductionmentioning

confidence: 99%

Universal transformation of displacement operators and its application to homodyne tomography in differing relativistic reference frames

Onoe

Ralph

2019

Phys. Rev. D

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In this paper, we study how a displacement of a quantum system appears under a change of relativistic reference frame. We introduce a generic method in which a displacement operator in one reference frame can be transformed into another reference frame. It is found that, when moving between non-inertial reference frames there can be distortions of phase information, modal structure and amplitude. We analyse how these effects affect traditional homodyne detection techniques. We then develop an in principle homodyne detection scheme which is robust to these effect, called the ideal homodyne detection scheme. We then numerically compare traditional homodyne detection with this in principle method and illustrate regimes when the traditional homodyne detection schemes fail to extract full quantum information.

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(γ,d)and(γ,t)reactions on6<

Cited by 6 publications

References 15 publications

Theory of channel simulation and bounds for private communication

Theory of channel simulation and bounds for private communication

Distributed Quantum Sensing Using Continuous-Variable Multipartite Entanglement

Universal transformation of displacement operators and its application to homodyne tomography in differing relativistic reference frames

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