Controllable Coherent Population Transfers in Superconducting Qubits for Quantum Computing

L. F. Wei, J. R. Johansson, L. X. Cen, S. Ashhab, and Franco Nori
Phys. Rev. Lett. 100, 113601 – Published 18 March 2008

Abstract

We propose an approach to coherently transfer populations between selected quantum states in one- and two-qubit systems by using controllable Stark-chirped rapid adiabatic passages. These evolution-time insensitive transfers, assisted by easily implementable single-qubit phase-shift operations, could serve as elementary logic gates for quantum computing. Specifically, this proposal could be conveniently demonstrated with existing Josephson phase qubits. Our proposal can find an immediate application in the readout of these qubits. Indeed, the broken parity symmetries of the bound states in these artificial atoms provide an efficient approach to design the required adiabatic pulses.

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  • Received 22 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.113601

©2008 American Physical Society

Authors & Affiliations

L. F. Wei1,2, J. R. Johansson3, L. X. Cen4, S. Ashhab3,5, and Franco Nori1,3,5

  • 1CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
  • 2Laboratory of Quantum Opt-electronics, Southwest Jiaotong University, Chengdu 610031, China
  • 3Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan
  • 4Department of Physics, Sichuan University, Chengdu, 610064, China
  • 5Center for Theoretical Physics, Physics Department, CSCS, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Vol. 100, Iss. 11 — 21 March 2008

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