Bell Inequalities with Postselection

Peres, Asher

doi:10.1007/978-94-017-2732-7_14

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…As far as we know, the term "postselection" has various meanings. It quite often refers to a method of selectively choose specific outcomes after many rounds of quantum measurements [23,24]. The postselection that we discuss here was introduced by Aaronson as "the power of discarding all runs of a computation in which a given event does not occur" [4].…”

Section: Comparison Between Lqc and Quantum Computing With Postselectionmentioning

confidence: 99%

School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

Zhuang

Huang

et al. 2019

Mathematical Biosciences and Engineering

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The crystallization kinetics and melting behavior of nylon 10,10 in neat nylon 10,10 and in nylon 10,10 -montmorillonite (MMT) nanocomposites were systematically investigated by differential scanning calorimetry. The crystallization kinetics results show that the addition of MMT facilitated the crystallization of nylon 10,10 as a heterophase nucleating agent; however, when the content of MMT was high, the physical hindrance of MMT layers to the motion of nylon 10,10 chains retarded the crystallization of nylon 10,10, which was also confirmed by polarized optical microscopy. However, both nylon 10,10 and nylon 10,10 -MMT nanocomposites exhibited multiple melting be-havior under isothermal and nonisothermal crystallization conditions. The temperature of the lower melting peak (peak I) was independent of MMT content and almost remained constant; however, the temperature of the highest melting peak (peak II) decreased with increasing MMT content due to the physical hindrance of MMT layers to the motion of nylon 10,10 chains.

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Section: Comparison Between Lqc and Quantum Computing With Postselectionmentioning

confidence: 99%

School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

Zhuang

Huang

et al. 2019

Mathematical Biosciences and Engineering

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“…An important feature of this scheme is that it allows Alice and Bob to perform a Bell test on the whole ensemble of the prepared states without sampling them. This, combined with the use of photodetectors of high efficiency closes the detection loophole and paves the way to performing a genuine loophole-free Bell test [26][27][28].…”

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confidence: 95%

Long-range distribution of multiphoton entanglement

Mycroft

Buraczewski

Barz

et al. 2019

Quantum Information and Measurement (QIM) V: Quantum Technologies

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We show that long-distance quantum communications can be enabled through resources provided by current quantum photonic technology: multiphoton bipartite entanglement and photon-numberresolved detection. Our protocol is robust to high transmission losses and facilitates distribution of near-maximally entangled states in realistic implementations. It can be realized in a delayedchoice scheme and it allows one to perform loophole-free Bell tests. The schema discussed can be employed as a versatile source of entanglement for e.g. establishing an Earth-to-space quantum channel, quantum metrology and quantum key distribution.Introduction.-Distribution of photonic entanglement is a key element to building quantum networks which facilitate secure long-distance quantum communications [1], distributed quantum computation [2] and sensing [3]. However, entanglement becomes corrupted by losses in the transmitting channels which results in low transmission rates. Since amplification of quantum signals is impossible [4], alternative remedies are on high demand. One option is to use quantum repeaters [5][6][7][8][9][10][11]. However, linking distant parties necessitates numerous intermediate stations, quantum memories and multiple two-photon Bell pairs, a resource that is often created nondeterministically. The other possibility is to use satellites and space-Earth quantum communications as shown recently [12]. In this scheme, Bell-pair entanglement was distributed over 1200 km, which was confirmed by a violation of Bell inequality yet under the fair sampling assumption. Thus, since the aforementioned solutions are challenging in implementation, it remains an open problem how to distribute entanglement in a way that is resource-efficient, verifiable and well suited to the existing quantum-photonic technology.Here we propose a protocol which allows one to establish long-distance quantum communications based on multiphoton bipartite entanglement and photon-numberresolved detection. It is robust to high symmetric transmission losses which, remarkably, deteriorate only the protocol efficiency, not the amount of generated entanglement. Furthermore, the procedure enables the parties sharing entanglement to perform a loophole-free Bell test.Bipartite entanglement between two physical systems, such as, for example, two photons is revealed by the fact that outcomes of subsequent local measurements in a certain degree of freedom on these two subsystems are random but always correlated, even when the particles are separated by a large distance [13]. Here, we focus on multi-photon bipartite entanglement. Experimentally, * magdalena.stobinska@gmail.com; Corresponding author this type of state can be created by means of spontaneous parametric down-conversion (SPDC) [14]. SPDC sources deterministically produce a two-mode squeezed vacuum (SV). This Gaussian quantum state carries entanglement between quadratures of electric field (continuous variables, CVs) but also between photon numbers in the two modes (discrete variables, DVs), which are un...

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On Possible Violation of the Clauser–Horne–Shimony–Holt Bell Inequality in a Classical Context

Broda

Szanecki

2011

J. Phys. Soc. Jpn.

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Bell Inequalities with Postselection

Cited by 4 publications

References 21 publications

School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

Long-range distribution of multiphoton entanglement

On Possible Violation of the Clauser–Horne–Shimony–Holt Bell Inequality in a Classical Context

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