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Ricottone, A.; Fang, Y. N.; Coish, W. A.
Balancing coherent and dissipative dynamics in a central-spin system
Source PublicationPHYSICAL REVIEW B
AbstractThe 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.
Cooperation Status国际
Subject AreaMaterials Science ; Physics
MOST Discipline CatalogueMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
Indexed BySCIE
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Document Type期刊论文
Affiliation1.[Ricottone, A.
2.Fang, Y. N.
3.Coish, W. A.] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
4.[Fang, Y. N.] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China
5.[Fang, Y. N.] Univ Chinese Acad Sci, Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
6.[Fang, Y. N.] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China
Recommended Citation
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.
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