中国物理B ›› 2011, Vol. 20 ›› Issue (3): 34203-034203.doi: 10.1088/1674-1056/20/3/034203

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Controllable cross-Kerr interaction between microwave photons in circuit quantum electrodynamics

廖洁桥1, 匡乐满1, 吴琴琴2   

  1. (1)Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China; (2)Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China;Department of Physics, Hunan Institute of Science and Technology, Yueyang 414000, China
  • 收稿日期:2010-09-04 修回日期:2010-11-01 出版日期:2011-03-15 发布日期:2011-03-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10775048 and 11075050), the National Basic Research Program of China (Grant No. 2007CB925204), and the Education Department of Hunan Province, China (Grant No. 08W012).

Controllable cross-Kerr interaction between microwave photons in circuit quantum electrodynamics

Wu Qin-Qin (吴琴琴)a)b), Liao Jie-Qiao(廖洁桥) a), and Kuang Le-Man(匡乐满)a)†   

  1. a Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Physics, Hunan Institute of Science and Technology, Yueyang 414000, China
  • Received:2010-09-04 Revised:2010-11-01 Online:2011-03-15 Published:2011-03-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10775048 and 11075050), the National Basic Research Program of China (Grant No. 2007CB925204), and the Education Department of Hunan Province, China (Grant No. 08W012).

摘要: We propose a scheme to enable a controllable cross-Kerr interaction between microwave photons in a circuit quantum electrodynamics (QED) system. In this scheme we use two transmission-line resonators (TLRs) and one superconducting quantum interference device (SQUID) type charge qubit, which acts as an artificial atom. It is shown that in the dispersive regime of the circuit-QED system, a controllable cross-Kerr interaction can be obtained by properly preparing the initial state of the qubit, and a large cross-phase shift between two microwave fields in the two TLRs can then be reached. Based on this cross-Kerr interaction, we show how to create a macroscopic entangled state between the two TLRs.

关键词: cross-Kerr-like interaction, circuit quantum electrodynamics, macroscopic entangled state

Abstract: We propose a scheme to enable a controllable cross-Kerr interaction between microwave photons in a circuit quantum electrodynamics (QED) system. In this scheme we use two transmission-line resonators (TLRs) and one superconducting quantum interference device (SQUID) type charge qubit, which acts as an artificial atom. It is shown that in the dispersive regime of the circuit-QED system, a controllable cross-Kerr interaction can be obtained by properly preparing the initial state of the qubit, and a large cross-phase shift between two microwave fields in the two TLRs can then be reached. Based on this cross-Kerr interaction, we show how to create a macroscopic entangled state between the two TLRs.

Key words: cross-Kerr-like interaction, circuit quantum electrodynamics, macroscopic entangled state

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
03.67.Lx (Quantum computation architectures and implementations)