Genuine multipartite entanglement detection with imperfect measurements: concept and experiment

• URL: http://arxiv.org/abs/2310.11946v2
• Date: Thu, 25 Apr 2024 23:47:17 GMT
• Title: Genuine multipartite entanglement detection with imperfect measurements: concept and experiment
• Authors: Huan Cao, Simon Morelli, Lee A. Rozema, Chao Zhang, Armin Tavakoli, Philip Walther,
• Abstract summary: We investigate the detection of genuine multipartite entanglement when measurements are subject to small imperfections. In a tabletop four-partite photonic experiment we demonstrate first how a small amount of alignment error can undermine the conclusions drawn from standard entanglement witnesses.
• Score: 3.3691648171019364
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Standard procedures for entanglement detection assume that experimenters can exactly implement specific quantum measurements. Here, we depart from such idealizations and investigate, in both theory and experiment, the detection of genuine multipartite entanglement when measurements are subject to small imperfections. For arbitrary qubits number $n$, we construct multipartite entanglement witnesses where the detrimental influence of the imperfection is independent of $n$. In a tabletop four-partite photonic experiment we demonstrate first how a small amount of alignment error can undermine the conclusions drawn from standard entanglement witnesses, and then perform the correction analysis. Furthermore, since we consider quantum devices that are trusted but not perfectly controlled, we showcase advantages in terms of noise resilience as compared to device-independent models.

Related papers

• Robust self-testing of the $m-$partite maximally entangled state and observables [0.0]
  We propose a simple and efficient self-testing protocol that certifies the state and observables based on the optimal quantum violation of the Svetlichny inequality. Our method leverages an elegant sum-of-squares approach to derive the optimal quantum value of the Svetlichny functional, devoid of assuming the dimension of the quantum system.
  arXiv  Detail & Related papers  (2024-08-20T11:03:37Z)
• Quantum null-hypothesis device-independent Schmidt rank witness [0.0]
  We investigate the dimensionality of bipartite quantum systems by construction of a device-independent null witness test. This test assesses whether a given bipartite state conforms with the expected quantum dimension, Schmidt number, and distinguishes between real and complex spaces.
  arXiv  Detail & Related papers  (2023-12-21T16:28:36Z)
• Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
  We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom. We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
  arXiv  Detail & Related papers  (2023-03-13T13:06:40Z)
• Practical tests for sub-Rayleigh source discriminations with imperfect demultiplexers [0.0]
  We show that for any, no matter how small, imperfections of the demultiplexer, this simple statistical test becomes practically useless. We propose a simple semi-separation-independent test, which provides a method for designing reliable experiments.
  arXiv  Detail & Related papers  (2023-03-05T12:06:05Z)
• Multipartite entanglement detection based on generalized state-dependent entropic uncertainty relation for multiple measurements [15.907303576427644]
  We present the generalized state-dependent entropic uncertainty relations for multiple measurement settings. We give the experimentally accessible lower bounds on both bipartite and tripartite entanglements.
  arXiv  Detail & Related papers  (2022-11-02T06:26:07Z)
• Experimentally determining the incompatibility of two qubit measurements [55.41644538483948]
  We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements. We demonstrate this fact in an optical setup, where the qubit states are encoded into the photons' polarization degrees of freedom.
  arXiv  Detail & Related papers  (2021-12-15T19:01:44Z)
• Observation-dependent suppression and enhancement of two-photon coincidences by tailored losses [68.8204255655161]
  Hong-Ou-Mandel (HOM) effect can lead to a perfect suppression of two-particle coincidences between the output ports of a balanced beam splitter. In this work, we demonstrate experimentally that the two-particle coincidence statistics of two bosons can instead be seamlessly tuned to substantial enhancement. Our findings reveal a new approach to harnessing non-Hermitian settings for the manipulation of multi-particle quantum states.
  arXiv  Detail & Related papers  (2021-05-12T06:47:35Z)
• Towards probing for hypercomplex quantum mechanics in a waveguide interferometer [55.41644538483948]
  We experimentally investigate the suitability of a multi-path waveguide interferometer with mechanical shutters for performing a test for hypercomplex quantum mechanics. We systematically analyse the influence of experimental imperfections that could lead to a false-positive test result.
  arXiv  Detail & Related papers  (2021-04-23T13:20:07Z)
• Symmetry allows for distinguishability in totally destructive many-particle interference [52.77024349608834]
  We investigate, in a four photon interference experiment in a laser-written waveguide structure, how symmetries control the suppression of many-body output events of a $J_x$ unitary. We show that totally destructive interference does not require mutual indistinguishability between all, but only between symmetrically paired particles.
  arXiv  Detail & Related papers  (2021-02-19T16:37:19Z)
• Nonlocality, steering and quantum state tomography in a single experiment [1.8631700158180744]
  We investigate whether paradigmatic measurements for quantum state tomography can be employed to certify quantum correlations. This allows us to perform state tomography on entangled qutrits, a test of Einstein-Podolsky-Rosen steering and a Bell inequality test, all within a single experiment.
  arXiv  Detail & Related papers  (2020-11-11T09:56:21Z)
• Quantum probes for universal gravity corrections [62.997667081978825]
  We review the concept of minimum length and show how it induces a perturbative term appearing in the Hamiltonian of any quantum system. We evaluate the Quantum Fisher Information in order to find the ultimate bounds to the precision of any estimation procedure. Our results show that quantum probes are convenient resources, providing potential enhancement in precision.
  arXiv  Detail & Related papers  (2020-02-13T19:35:07Z)

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.