Einstein-Podolsky-Rosen Steering in Two-sided Sequential Measurements with One Entangled Pair

• URL: http://arxiv.org/abs/2102.02550v2
• Date: Mon, 1 Mar 2021 05:54:04 GMT
• Title: Einstein-Podolsky-Rosen Steering in Two-sided Sequential Measurements with One Entangled Pair
• Authors: Jie Zhu, Meng-Jun Hu, Guang-Can Guo, Chuan-Feng Li, and Yong-Sheng Zhang
• Abstract summary: Non-locality and quantum measurement are two fundamental topics in quantum theory. Non-locality sharing among multiple observers is predicted and experimentally observed. Double EPR steering can be demonstrated simultaneously while double Bell-CHSH inequalityviolations are shown to be impossible.
• Score: 5.180965147147337
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-locality and quantum measurement are two fundamental topics in quantum theory and theirinterplay attracts intensive focus since the discovery of Bell theorem. Non-locality sharing amongmultiple observers is predicted and experimentally observed. However, only one-sided sequentialcase, i.e., one Alice and multiple Bobs is widely discussed and little is known about two-sided case.Here, we theoretically and experimentally explore the non-locality sharing in two-sided sequentialmeasurements case in which one entangled pair is distributed to multiple Alices and Bobs. Weexperimentally observed double EPR steering among four observers in the photonic system for thefirst time. In the case that all observers adopt the same measurement strength, it is observedthat double EPR steering can be demonstrated simultaneously while double Bell-CHSH inequalityviolations are shown to be impossible. The exact formula relating Bell quantity and sequential weakmeasurements for arbitrary many Alices and Bobs is also derived, showing that no more doubleBell-CHSH inequality violations is possible under unbiased input condition. The results not onlydeepen our understanding of relation between sequential measurements and non-locality but alsomay find important applications in quantum information tasks.

Related papers

• Measuring the Evolution of Entanglement in Compton Scattering [101.11630543545151]
  The behavior of quantum entanglement during scattering is identical to the behavior of initially classically correlated photons up to a constant factor equal to two. Our dedicated experiment with photons confirms these results and explains the "Puzzle of Decoherence" observed recently.
  arXiv  Detail & Related papers  (2024-06-20T14:21:23Z)
• (Almost-)Quantum Bell Inequalities and Device-Independent Applications [3.7482527016282963]
  We present families of (almost)quantum Bell inequalities and highlight three foundational and DI applications. We derive quantum Bell inequalities that show a separation of the quantum boundary from certain portions of the no-signaling boundary of dimension up to 4k-8. We provide the most precise characterization of the quantum boundary known so far.
  arXiv  Detail & Related papers  (2023-09-12T15:13:02Z)
• Sharing EPR steering between sequential pairs of observers [0.0]
  We show that sequential Alice-Bob pairs can share the EPR steering as long as the initially shared state is an entangled two-qubit pure state. The claim is also true for particular class of mixed entangled states.
  arXiv  Detail & Related papers  (2023-07-19T12:06:04Z)
• Quantum Discord Witness with Uncharacterized Devices [18.751513188036334]
  We propose a new approach using uncharacterized measurements to witness quantum discord of an unknown bipartite state within arbitrary dimension system. The feature of high robustness against device imperfections, such as loss-tolerance and error-tolerance, shows our method is experimentally feasible.
  arXiv  Detail & Related papers  (2023-03-20T14:51:53Z)
• Bell inequalities with overlapping measurements [52.81011822909395]
  We study Bell inequalities where measurements of different parties can have overlap. This allows to accommodate problems in quantum information. The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry.
  arXiv  Detail & Related papers  (2023-03-03T18:11:05Z)
• Experimental demonstration of optimal unambiguous two-out-of-four quantum state elimination [52.77024349608834]
  A core principle of quantum theory is that non-orthogonal quantum states cannot be perfectly distinguished with single-shot measurements. Here we implement a quantum state elimination measurement which unambiguously rules out two of four pure, non-orthogonal quantum states.
  arXiv  Detail & Related papers  (2022-06-30T18:00:01Z)
• Events in quantum mechanics are maximally non-absolute [0.9176056742068814]
  We prove that quantum correlations can be maximally non-absolute according to both quantifiers. We show that chained Bell inequalities (and relaxations thereof) are also valid constraints for Wigner's experiment.
  arXiv  Detail & Related papers  (2021-12-19T21:15:16Z)
• Demonstration of quantum correlations that are incompatible with absoluteness of measurement [0.0]
  We exploit the tension between the two dynamics of quantum theory (QT) in the Wigner's Friend thought experiment. We show that the set of probabilities obtainable for NoM is strictly larger than the set obtainable for AoM.
  arXiv  Detail & Related papers  (2021-07-18T13:32:32Z)
• Observers of quantum systems cannot agree to disagree [55.41644538483948]
  We ask whether agreement between observers can serve as a physical principle that must hold for any theory of the world. We construct examples of (postquantum) no-signaling boxes where observers can agree to disagree.
  arXiv  Detail & Related papers  (2021-02-17T19:00:04Z)
• Experimental study of decoherence of the two-mode squeezed vacuum state via second harmonic generation [19.5474623165562]
  We report a novel scheme on the study of decoherence of a two-mode squeezed vacuum state via its second harmonic generation signal. Our scheme can directly extract the decoherence of the phase-sensitive quantum correlation $langle hatahatbrangle$ between two entangled modes. This is an experimental study on the decoherence effect of a squeezed vacuum state, which has been rarely investigated.
  arXiv  Detail & Related papers  (2020-12-22T05:38:24Z)
• Non-locality can be Shared between Alice and three Bobs in unbiased settings case [0.0]
  A well-known property of quantum nonlocality is monogamy. We show that it is possible to observe a triple violation of CHSH inequality between Alice and three Bobs.
  arXiv  Detail & Related papers  (2020-06-30T01:33:20Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.