Balancing coherent and dissipative dynamics in a central-spin system

doi:10.1103/PhysRevB.102.085413

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	Balancing coherent and dissipative dynamics in a central-spin system
	Ricottone, A.; Fang, Y. N.; Coish, W. A.
刊名	PHYSICAL REVIEW B
	2020
卷号	102 期号:8 页码:85413
关键词	NUCLEAR SPINS ELECTRON-SPIN QUANTUM PARADOX GATE
ISSN号	2469-9950
DOI	10.1103/PhysRevB.102.085413
英文摘要	The average time required for an open quantum system to reach a steady state (the steady-state time) is generally determined through a competition of coherent and incoherent (dissipative) dynamics. Here, we study this competition for a ubiquitous central-spin system, corresponding to a central-spin-1/2 coherently coupled to ancilla spins and undergoing dissipative spin relaxation. The ancilla system can describe N spins-1/2 or, equivalently, a single large spin of length I = N/2. We find exact analytical expressions for the steady-state time in terms of the dissipation rate, resulting in a minimal (optimal) steady-state time at an optimal value of the dissipation rate, according to a universal curve. Due to a collective-enhancement effect, the optimized steady-state time grows only logarithmically with increasing N = 21, demonstrating that the system size can be grown substantially with only a moderate cost in steady-state time. This paper has direct applications to the rapid initialization of spin qubits in quantum dots or bound to donor impurities, to dynamic nuclear-spin polarization protocols, and may provide key intuition for the benefits of error-correction protocols in quantum annealing.
学科主题	Materials Science ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27162]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.[Fang, Y. N.] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China 2.Coish, W. A.] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada 3.[Fang, Y. N.] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China 4.[Ricottone, A. 5.Fang, Y. N. 6.[Fang, Y. N.] Univ Chinese Acad Sci, Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Ricottone, A.,Fang, Y. N.,Coish, W. A.. Balancing coherent and dissipative dynamics in a central-spin system[J]. PHYSICAL REVIEW B,2020,102(8):85413.
APA	Ricottone, A.,Fang, Y. N.,&Coish, W. A..(2020).Balancing coherent and dissipative dynamics in a central-spin system.PHYSICAL REVIEW B,102(8),85413.
MLA	Ricottone, A.,et al."Balancing coherent and dissipative dynamics in a central-spin system".PHYSICAL REVIEW B 102.8(2020):85413.