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Resource-Efficient Measurement-Device-Independent Entanglement Witness

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [1];  [1]
  1. Univ. of Geneva (Switzerland). Group of Applied Physics
  2. Univ. of Geneva (Switzerland). Group of Applied Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division. Quantum Information Science Group
Imperfections in experimental measurement schemes can lead to falsely identifying, or over estimating, entanglement in a quantum system. A recent solution to this is to define schemes that are robust to measurement imperfections—measurement-device-independent entanglement witness (MDI-EW). This approach can be adapted to witness all entangled qubit states for a wide range of physical systems and does not depend on detection efficiencies or classical communication between devices. In this paper, we extend the theory to remove the necessity of prior knowledge about the two-qubit states to be witnessed. Moreover, we tested this model via a novel experimental implementation for MDI-EW that significantly reduces the experimental complexity. Finally, by applying it to a bipartite Werner state, we demonstrate the robustness of this approach against noise by witnessing entanglement down to an entangled state fraction close to 0.4.
Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Swiss National Sciences Foundation (Switzerland); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1261284
Alternate ID(s):
OSTI ID: 1252129
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 116; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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All Entangled Quantum States Are Nonlocal journal May 2012
Measurement-Device-Independent Entanglement Witnesses for All Entangled Quantum States journal February 2013
Device-Independent Entanglement Quantification and Related Applications journal July 2013
Implementation of a Measurement-Device-Independent Entanglement Witness journal April 2014
Systematic Errors in Current Quantum State Tomography Tools journal February 2015
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Cited By (15)

Design and experimental performance of local entanglement witness operators journal January 2020
Efficient measurement-device-independent detection of multipartite entanglement structure journal July 2016
Measurement-device-independent entanglement and randomness estimation in quantum networks journal April 2017
Practical measurement-device-independent entanglement quantification journal November 2018
Measurement-device-independent and arbitrarily loss-tolerant verification of quantum steering journal January 2019
Measurement-Device-Independent Approach to Entanglement Measures journal April 2017
Device-Independent Entanglement Certification of All Entangled States journal October 2018
Experimental Measurement-Device-Independent Quantum Steering and Randomness Generation Beyond Qubits journal October 2019
Experimentally Verified Approach to Nonentanglement-Breaking Channel Certification journal January 2020
Measurement-Device-Independent Verification of Quantum Channels journal January 2020
Resource Theory of Quantum Memories and Their Faithful Verification with Minimal Assumptions journal May 2018
Efficient measurement-device-independent detection of multipartite entanglement structure text January 2016
A resource theory of quantum memories and their faithful verification with minimal assumptions text January 2017
Measurement-device-independent and arbitrarily loss-tolerant verification of quantum steering text January 2018
An Experimentally Verified Approach to non-Entanglement-Breaking Channel Certification text January 2019

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