Widening the sharpness modulation region of an entanglement-assisted sequential quantum random access code: Theory, experiment, and application

Xiao, Ya; Han, Xin-Hong; Fan, Xuan; Qu, Hui-Chao; Gu, Yu

doi:10.1103/physrevresearch.3.023081

Cited by 11 publications

(4 citation statements)

References 33 publications

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“…The MTB [43] protocol of 2-bit sequential quantum RAC for certifying the unsharpness parameter has recently been experimentally tested in [45][46][47]. Our protocols can also be tested using the existing technology already adopted in [45][46][47]. Finally, our protocol can also be extended to arbitrarybit sequential RAC or other parity-oblivious communication games [66] which may demonstrate the quantum advantage to more independent observers.…”

Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

“…MTB protocol [43] also provided a certified interval of values of sharpness parameter in loss tolerant scenario. MTB proposal has been experimentally tested in [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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Semi-device independent certification of multiple unsharpness parameters through sequential measurements

Mukherjee¹,

K.²

2021

Preprint

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Based on a sequential communication game, semi-device independent certification of an unsharp instrument has recently been demonstrated [New J. Phys. 21 083034 (2019), Phys. Rev. Research 2, 033014 (2020]. In this paper, we provide semi-device independent self-testing protocols in the prepare-measure scenario to certify multiple unsharpness parameters along with the states and the measurement settings. This is achieved through the sequential quantum advantage shared by multiple independent observers in a suitable communication game known as parity-oblivious random-access-code. We demonstrate that in 3-bit parity-oblivious random-accesscode, at most three independent observers can sequentially share quantum advantage. The optimal pair (triple) of quantum advantages enables us to uniquely certify the qubit states, the measurement settings, and the unsharpness parameter(s). The practical implementation of a given protocol involves inevitable losses. In a sub-optimal scenario, we derive a certified interval within which a specific unsharpness parameter has to be confined. We extend our treatment to the 4-bit case and show that at most two observers can share quantum advantage for the qubit system. Further, we provide a sketch to argue that four sequential observers can share the quantum advantage for the two-qubit system, thereby enabling the certification of three unsharpness parameters.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

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Semi-device independent certification of multiple unsharpness parameters through sequential measurements

Mukherjee¹,

K.²

2021

Preprint

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“…Since then, unsharp measurement has been widely applied in sharing quantum correlations [17], such as standard Bell nonlocality [18][19][20][21][22][23], network nonlocality [24][25][26][27][28][29], steering [30][31][32][33][34][35][36][37][38][39], entanglement [40][41][42][43][44], coherence [45,46], and contextuality [47,48]. Moreover, it has been observed that these shared quantum correlations are closely connected to numerous quantum information tasks, including quantum random access code [49][50][51][52], randomness certification [53][54][55], self-testing [56,57] and revealing 'hidden' nonlocality [58].…”

Section: Introductionmentioning

confidence: 99%

Experimental sharing of Bell nonlocality with projective measurements

Xiao,

Xin Rong,

Wang

et al. 2024

New J. Phys.

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\textcolor{red}{In the standard Bell experiment, two parties perform local projective measurements on a shared pair of entangled qubits to generate nonlocal correlations. However, these measurements completely destroy the entanglement, rendering the post-measurement state unable for subsequent use. For a long time, it was believed that only unsharp measurements can be used to share quantum correlations. Remarkably, recent research has shown that classical randomness assisted projective measurements are sufficient for sharing nonlocality} [Phys. Rev. Lett. 129, 230402 (2022)]. Here, by stochastically combining no more than two different projective measurement strategies, we report an \textcolor{red}{experimental} observation of \textcolor{red}{double Clauser-Horne-Shimony-Holt (CHSH) inequality violations with two measurements in a sequence made on each pair of maximally and partially entangled} polarization photons. Our results reveal that the double violation achieved by partially entangled states can be 11 standard deviations larger than that achieved by maximally entangled ones. Our scheme eliminates the requirement for entanglement assistance in previous unsharp-measurement-based sharing schemes, making it experimentally easier. Our work provides possibilities for sharing other types of quantum correlations in various physical systems with projective measurements.

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Quantum Random Access Codes Implementation for Resource Allocation and Coexistence with Classical Telecommunication

Ribezzo,

Salazar,

Czartowski

et al. 2023

Adv Quantum Tech

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In a world where Quantum Networks are rapidly becoming a reality, the development of the Quantum Internet is gaining increasing interest. Nevertheless, modern quantum networks are still in the early stages of development and have limited capacity to distribute resources among different users – a constraint that needs to be taken into account. In this work, it aims to investigate these constraints, using a novel setup for implementing Quantum Random Access Codes (QRACs), communication protocols known for their quantum advantage over their classical counterparts and semi‐ device‐independent self‐testing applications. The QRAC states, made for the first time using weak coherent pulses instead of entangled single photons, allow us to experimentally test the encoding and decoding strategy from the resource allocation perspective. Moreover, by emulating a coexistent classical communication, it test the resilience of the implementation in presence of noise. The achieved results represent a significant milestone both for theoretical studies of quantum resource allocation and for the implementation of quantum infrastructures capable of coexisting with regular telecommunication networks.

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Widening the sharpness modulation region of an entanglement-assisted sequential quantum random access code: Theory, experiment, and application

Cited by 11 publications

References 33 publications

Semi-device independent certification of multiple unsharpness parameters through sequential measurements

Semi-device independent certification of multiple unsharpness parameters through sequential measurements

Experimental sharing of Bell nonlocality with projective measurements

Quantum Random Access Codes Implementation for Resource Allocation and Coexistence with Classical Telecommunication

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