Simultaneous Cooling of an Artificial Atom and Its Neighboring Quantum System

J. Q. You, Yu-xi Liu, and Franco Nori
Phys. Rev. Lett. 100, 047001 – Published 31 January 2008

Abstract

We propose an approach for cooling both an artificial atom (e.g., a flux qubit) and its neighboring quantum system, the latter modeled by either a quantum two-level system or a quantum resonator. The flux qubit is cooled by manipulating its states, following an inverse process of state population inversion, and then the qubit is switched on to resonantly interact with the neighboring quantum system. By repeating these steps, the two subsystems can be simultaneously cooled. Our results show that this cooling is robust and effective, irrespective of the chosen quantum systems connected to the qubit.

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  • Received 25 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.047001

©2008 American Physical Society

Authors & Affiliations

J. Q. You1,2, Yu-xi Liu2,3, and Franco Nori2,3,4

  • 1Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China
  • 2Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan
  • 3CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
  • 4Center for Theoretical Physics, Physics Department, Center for the Study of Complex Systems, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Issue

Vol. 100, Iss. 4 — 1 February 2008

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