Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large Josephson junction

Y. D. Wang, P. Zhang, D. L. Zhou, and C. P. Sun
Phys. Rev. B 70, 224515 – Published 15 December 2004

Abstract

We propose a theoretical protocol for quantum logic gates between two Josephson junction charge-phase qubits through the control of their coupling to a large junction whose Josephson coupling energy is much larger than its Coulomb charge energy. In the low excitation limit of the large junction, it behaves effectively as a quantum data-bus mode of a harmonic oscillator. Our protocol can be fast since it does not require the data-bus to stay adiabatically in its ground state, as such it can be implemented over a wide parameter regime independent of the data-bus quantum state.

  • Figure
  • Received 1 March 2004

DOI:https://doi.org/10.1103/PhysRevB.70.224515

©2004 American Physical Society

Authors & Affiliations

Y. D. Wang, P. Zhang, D. L. Zhou, and C. P. Sun*

  • Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing, 100080, China

  • *Electronic address: suncp@itp.ac.cn; www site: http://www.itp.ac.cn/̃suncp.

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Vol. 70, Iss. 22 — 1 December 2004

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