Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement

doi:10.1103/PhysRevLett.123.050603

	Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement
	Liu, Ren-Bao 1,5; Wang, Ping 5; Chen, Chong 5; Peng, Xinhua 2,3,4; Wrachtrup, Jorg 6,7,8
刊名	PHYSICAL REVIEW LETTERS
	2019-08-01
卷号	123 期号:5 页码:6
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.123.050603
通讯作者	Liu, Ren-Bao(rbliu@cuhk.edu.hk)
英文摘要	Correlations of fluctuations are the driving forces behind the dynamics and thermodynamics in quantum many-body systems. For qubits embedded in a quantum bath, the correlations in the bath are key to understanding and combating decoherence-a critical issue in quantum information technology. However, there is no systematic method for characterizing the many-body correlations in quantum baths beyond the second order or the Gaussian approximation. Here we present a scheme to characterize the correlations in a quantum bath to arbitrary order. The scheme employs a weak measurement of the bath via the projective measurement of a central system. The bath correlations, including both the "classical" and the "quantum" parts, can be reconstructed from the correlations of the measurement outputs. The possibility of full characterization of many-body correlations in a quantum bath forms the basis for optimizing quantum control against decoherence in realistic environments, for studying the quantum characteristics of baths, and for the quantum sensing of correlated clusters in quantum baths.
资助项目	Hong Kong RGC-NSFC Joint Scheme[N_CUHK403/16] ; National Key Research and Development Program of China[2018YFA0306600] ; Anhui Initiative in Quantum Information Technologies[AHY050000] ; National Natural Science Foundation of China[11425523] ; National Natural Science Foundation of China[11661161018] ; European Union via EU ERC grant SMeL ; EU project ASTERIQS ; Volkswagen Foundation
WOS关键词	DECOHERENCE ; SUPPRESSION ; SYSTEM
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000479003800002
资助机构	Hong Kong RGC-NSFC Joint Scheme ; National Key Research and Development Program of China ; Anhui Initiative in Quantum Information Technologies ; National Natural Science Foundation of China ; European Union via EU ERC grant SMeL ; EU project ASTERIQS ; Volkswagen Foundation
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/132864]
专题	中国科学院近代物理研究所
通讯作者	Liu, Ren-Bao
作者单位	1.Chinese Univ Hong Kong, Hong Kong Inst Quantum Informat Sci & Technol, Shatin, Hong Kong, Peoples R China 2.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China 3.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 4.Univ Sci & Technol China, CAS Key Lab Microscale Magnet Resonance & Synerge, Ctr Quantum Informat & Quantum Phys, Hefei 230026, Anhui, Peoples R China 5.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China 6.Univ Stuttgart, Inst Phys 3, Res Ctr, SCoPE, D-70569 Stuttgart, Germany 7.Univ Stuttgart, IQST, D-70569 Stuttgart, Germany 8.Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany
推荐引用方式 GB/T 7714	Liu, Ren-Bao,Wang, Ping,Chen, Chong,et al. Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement[J]. PHYSICAL REVIEW LETTERS,2019,123(5):6.
APA	Liu, Ren-Bao,Wang, Ping,Chen, Chong,Peng, Xinhua,&Wrachtrup, Jorg.(2019).Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement.PHYSICAL REVIEW LETTERS,123(5),6.
MLA	Liu, Ren-Bao,et al."Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement".PHYSICAL REVIEW LETTERS 123.5(2019):6.