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NMR Quantum Information Processing: Indian Contributions and Perspectives. J Indian Inst Sci 2023. [DOI: 10.1007/s41745-022-00353-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Bera A, Das T, Sadhukhan D, Singha Roy S, Sen De A, Sen U. Quantum discord and its allies: a review of recent progress. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:024001. [PMID: 28824014 DOI: 10.1088/1361-6633/aa872f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We review concepts and methods associated with quantum discord and related topics. We also describe their possible connections with other aspects of quantum information and beyond, including quantum communication, quantum computation, many-body physics, and open quantum dynamics. Quantum discord in the multiparty regime and its applications are also discussed.
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Affiliation(s)
- Anindita Bera
- Department of Applied Mathematics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700 009, India. Harish-Chandra Research Institute, HBNI, Chhatnag Road, Jhunsi, Allahabad 211019, India
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Silva IA, Girolami D, Auccaise R, Sarthour RS, Oliveira IS, Bonagamba TJ, deAzevedo ER, Soares-Pinto DO, Adesso G. Measuring bipartite quantum correlations of an unknown state. PHYSICAL REVIEW LETTERS 2013; 110:140501. [PMID: 25166969 DOI: 10.1103/physrevlett.110.140501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Indexed: 06/03/2023]
Abstract
We report the experimental measurement of bipartite quantum correlations of an unknown two-qubit state. Using a liquid state Nuclear Magnetic Resonance setup and employing geometric discord, we evaluate the quantum correlations of a state without resorting to prior knowledge of its density matrix. The method is applicable to any 2 ⊗ d system and provides, in terms of number of measurements required, an advantage over full state tomography scaling with the dimension d of the unmeasured subsystem. The negativity of quantumness is measured as well for reference. We also observe the phenomenon of sudden transition of quantum correlations when local phase and amplitude damping channels are applied to the state.
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Affiliation(s)
- I A Silva
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil
| | - D Girolami
- School of Mathematical Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - R Auccaise
- Empresa Brasileira de Pesquisa Agropecuária, Rua Jardim Botânico 1024, 22460-000 Rio de Janeiro, Brazil
| | - R S Sarthour
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Brazil
| | - I S Oliveira
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Brazil
| | - T J Bonagamba
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil
| | - E R deAzevedo
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil
| | - D O Soares-Pinto
- Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil
| | - G Adesso
- School of Mathematical Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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Serra RM, Oliveira IS. Nuclear magnetic resonance quantum information processing. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:4615-4619. [PMID: 22946031 PMCID: PMC3441066 DOI: 10.1098/rsta.2012.0332] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
For the past decade, nuclear magnetic resonance (NMR) has been established as a main experimental technique for testing quantum protocols in small systems. This Theme Issue presents recent advances and major challenges of NMR quantum information possessing (QIP), including contributions by researchers from 10 different countries. In this introduction, after a short comment on NMR-QIP basics, we briefly anticipate the contents of this issue.
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Affiliation(s)
- R M Serra
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, R. Santa Adélia 166, 09210-170 Santo André, São Paulo, Brazil.
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Xu H, Fu D, Wang ZS, Pan H. Dynamic evolution for liquid-state nuclear spins and Berry phase of mixed state in a magnetic resonance. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 223:25-30. [PMID: 22960670 DOI: 10.1016/j.jmr.2012.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 06/26/2012] [Accepted: 07/09/2012] [Indexed: 06/01/2023]
Abstract
Dynamic evolution for liquid-state nuclear spin in a magnetic resonance is investigated based on Bloch sphere structure under the time-dependent modified Bloch equation. We show that the magnetization is related to the magnetic field strength but approximately independent of the initial unpolarized spin state after a very short evolving time. We predict that the Berry phase transition of the nuclear spin system take place in a quasicyclic evolution for some initial states, resulting in that the evolving memory of nuclear spin polarization is kept in terms of the Berry phase. The findings provide another clue to search for quantum memory devices in such a system on the basis of the geometric phase.
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Affiliation(s)
- Hualan Xu
- College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, PR China
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