Experimental test of nonclassicality with arbitrarily low detection efficiency

Hameedi, Alley; Marques, Breno; Mironowicz, Piotr; Saha, Debashis; Pawłowski, Marcin; Bourennane, Mohamed

doi:10.1103/physreva.102.032621

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…For instance in two randomness expansion experiments presented in [58,59] the parties Alice and Bob were separated by about 200 m. A novel method for overcoming the locality loophole is given in [60] where a method of quantifying the amount of crosstalk was estimated. A complementary approach exhibiting crosstalk in experiments, but not considered in the framework of randomness certification was delivered by some of us in [61]. In this work, we do not address the problem of closing the loopholes, and leave them for future work.…”

Section: Discussionmentioning

confidence: 99%

Experimental certification of more than one bit of quantum randomness in the two inputs and two outputs scenario

Jean-Marie Seguinard,

Piveteau,

Mironowicz

et al. 2023

New J. Phys.

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One of the striking properties of quantum mechanics is the occurrence of the Bell-type non-locality. They are a fundamental feature of the theory that allows two parties that share an entangled quantum system to observe correlations stronger than possible in classical physics. In addition to their theoretical significance, non-local correlations have practical applications, such as device-independent randomness generation, providing private unpredictable numbers even when they are obtained using devices delivered by an untrusted vendor. Thus, determining the quantity of certifiable randomness that can be produced using a specific set of non-local correlations is of significant interest. In this paper, we present an experimental realization of recent Bell-type operators designed to provide private random numbers that are secure against adversaries with quantum resources. We use semi-definite programming to provide lower bounds on the generated randomness in terms of both min-entropy and von Neumann entropy in a device-independent scenario. We compare experimental setups providing Bell violations close to the Tsirelson's bound with lower rates of events, with setups having slightly worse levels of violation but higher event rates. Our results demonstrate the first experiment that certifies close to two bits of randomness from binary measurements of two parties. Apart from single-round certification, we provide an analysis of finite-key protocol for quantum randomness expansion using the Entropy Accumulation Theorem and show its advantages compared to existing solutions.

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Section: Discussionmentioning

confidence: 99%

Experimental certification of more than one bit of quantum randomness in the two inputs and two outputs scenario

Jean-Marie Seguinard,

Piveteau,

Mironowicz

et al. 2023

New J. Phys.

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“…Since the adversary cannot know in advance how they will be paired, then the adversary must resort to using common seed to all the parts, e.g., a synchronized timer. In this case, correlations between inputs and outputs will be observed, as discussed in [16]. (ii) When a signal sent from an external synchronizer causes correlations between P and M. This case can be avoided by invoking a standard assumption in all cryptographic schemes, namely, that P and M are inside a shielded laboratory, and thus a shared seed cannot be sent from the outside.…”

Section: Introductionmentioning

confidence: 99%

Quantum randomness protected against detection loophole attacks

Mironowicz

Cañas

Cariñe

et al. 2021

Quantum Inf Process

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Device and semi-device-independent private quantum randomness generators are crucial for applications requiring private randomness. However, they are vulnerable to detection inefficiency attacks and this limits severely their usage for practical purposes. Here, we present a method for protecting semi-device-independent private quantum randomness generators in prepare-and-measure scenarios against detection inefficiency attacks. The key idea is the introduction of a blocking device that adds failures in the communication between the preparation and measurement devices. We prove that, for any detection efficiency, there is a blocking rate that provides protection against these attacks. We experimentally demonstrate the generation of private randomness using weak coherent states and standard avalanche photo-detectors.

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“…Obtaining a value greater than T c from the observed statistics certifies the communicated quantum system to be of at least dimension d. Quantum random access codes (QRACs), a primitive quantum communication protocol [13][14][15], can be used for this purpose. The original study of QRACs was restricted to two-dimensional systems [11] and was later generalized to higher dimensions [16][17][18] yielding several interesting results in quantum communication [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Device-independent witness of arbitrary-dimensional quantum systems employing binary-outcome measurements

et al. 2018

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Device independent dimension witnesses (DW) are a remarkable way to test the dimension of a quantum system in a prepare-and-measure scenario imposing minimal assumptions on the internal features of the devices. However, as the dimension increases, the major obstacle in the realization of DW arises due to the requirement of many outcome quantum measurements. In this article, we propose a new variant of a widely studied communication task (random access code) and take its average payoff as the DW. The presented DW applies to arbitrarily large quantum systems employing only binary outcome measurements. I. INTRODUCTIONRealizing higher-dimensional quantum systems with full control is one of the crucial barriers towards implementing many quantum information processing protocols and testing the foundations of physics. While the process of quantum tomography allows us to reconstruct a quantum system, however, it requires the assumption of fully characterized measurement devices. The device independent framework [1,2] in a prepare-and-measure experiment provides a methodology to obtain a lower bound on the dimension without assuming the internal features of the devices. Moreover, quantum advantages in information processing, for example, quantum communication complexity [3,4] are linked to this approach. Despite its merits, implementing device independent dimension witnesses (DWs) for higher dimensional quantum systems [5-9] faces several complications.

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Experimental test of nonclassicality with arbitrarily low detection efficiency

Cited by 5 publications

References 32 publications

Experimental certification of more than one bit of quantum randomness in the two inputs and two outputs scenario

Experimental certification of more than one bit of quantum randomness in the two inputs and two outputs scenario

Quantum randomness protected against detection loophole attacks

Device-independent witness of arbitrary-dimensional quantum systems employing binary-outcome measurements

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