Reply to "comment on 'How to observe and quantify quantum-discord states via correlations' "

Matthew A. Hunt; Igor V. Lerner; Igor V. Yurkevich; Yuval Gefen

doi:10.1103/PhysRevA.102.016402

Reply to "comment on 'How to observe and quantify quantum-discord states via correlations' "

Matthew A. Hunt
, Igor V. Lerner
, Igor V. Yurkevich
, Yuval Gefen

Aston University

University College Birmingham
Weizmann Institute of Science

Research output: Contribution to journal › Letter, comment/opinion or interview › peer-review

1 Citation (Scopus)

Abstract

The authors of the preceding Comment [Kumar and Snizhko, Phys. Rev. A 102, 016401 (2020)10.1103/PhysRevA.102.016401] made two critical remarks regarding the protocol for detecting and quantifying quantumness of separable states presented in our paper [Hunt, Phys. Rev. A 100, 022321 (2019)2469-992610.1103/PhysRevA.100.022321]. One is that our protocol is not "experiment friendly"in comparison to full quantum state tomography. The other is that the suggested quantifier fails to distinguish different degrees of quantumness within the family of Werner states. We will show that, while being technically correct, both remarks referred to generalizations of our protocol which had been neither suggested nor intended. We will reiterate why the proposed protocol would be advantageous, compared to full or partial quantum state tomography, for detecting and quantifying discord in many-body bipartite states.

Original language	English
Article number	016402
Journal	Physical Review A
Volume	102
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.102.016402
Publication status	Published - 23 Jul 2020

Funding

We gratefully acknowledge support by Leverhulme Trust Grant No. VP1-2015-005 (I.V.Y., Y.G.), EPSRC Grant No. EP/R029075/1 (I.V.L.), and the Italia-Israel project QUANTRA, the ISF of the Israeli Academy of Sciences and Humanities, and DFG (German Research Foundation) Grant No. EG 96/13-1 (Y.G.).

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10.1103/PhysRevA.102.016402

Cite this

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title = "Reply to {"}comment on 'How to observe and quantify quantum-discord states via correlations' {"}",

abstract = "The authors of the preceding Comment [Kumar and Snizhko, Phys. Rev. A 102, 016401 (2020)10.1103/PhysRevA.102.016401] made two critical remarks regarding the protocol for detecting and quantifying quantumness of separable states presented in our paper [Hunt, Phys. Rev. A 100, 022321 (2019)2469-992610.1103/PhysRevA.100.022321]. One is that our protocol is not {"}experiment friendly{"}in comparison to full quantum state tomography. The other is that the suggested quantifier fails to distinguish different degrees of quantumness within the family of Werner states. We will show that, while being technically correct, both remarks referred to generalizations of our protocol which had been neither suggested nor intended. We will reiterate why the proposed protocol would be advantageous, compared to full or partial quantum state tomography, for detecting and quantifying discord in many-body bipartite states. ",

author = "Hunt, \{Matthew A.\} and Lerner, \{Igor V.\} and Yurkevich, \{Igor V.\} and Yuval Gefen",

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AU - Hunt, Matthew A.

AU - Lerner, Igor V.

AU - Yurkevich, Igor V.

AU - Gefen, Yuval

PY - 2020/7/23

Y1 - 2020/7/23

N2 - The authors of the preceding Comment [Kumar and Snizhko, Phys. Rev. A 102, 016401 (2020)10.1103/PhysRevA.102.016401] made two critical remarks regarding the protocol for detecting and quantifying quantumness of separable states presented in our paper [Hunt, Phys. Rev. A 100, 022321 (2019)2469-992610.1103/PhysRevA.100.022321]. One is that our protocol is not "experiment friendly"in comparison to full quantum state tomography. The other is that the suggested quantifier fails to distinguish different degrees of quantumness within the family of Werner states. We will show that, while being technically correct, both remarks referred to generalizations of our protocol which had been neither suggested nor intended. We will reiterate why the proposed protocol would be advantageous, compared to full or partial quantum state tomography, for detecting and quantifying discord in many-body bipartite states.

AB - The authors of the preceding Comment [Kumar and Snizhko, Phys. Rev. A 102, 016401 (2020)10.1103/PhysRevA.102.016401] made two critical remarks regarding the protocol for detecting and quantifying quantumness of separable states presented in our paper [Hunt, Phys. Rev. A 100, 022321 (2019)2469-992610.1103/PhysRevA.100.022321]. One is that our protocol is not "experiment friendly"in comparison to full quantum state tomography. The other is that the suggested quantifier fails to distinguish different degrees of quantumness within the family of Werner states. We will show that, while being technically correct, both remarks referred to generalizations of our protocol which had been neither suggested nor intended. We will reiterate why the proposed protocol would be advantageous, compared to full or partial quantum state tomography, for detecting and quantifying discord in many-body bipartite states.

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Reply to "comment on 'How to observe and quantify quantum-discord states via correlations' "

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