Controllable cross-Kerr interaction between microwave photons in circuit quantum electrodynamics |
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| Authors: | Wu Qin-Qin Liao Jie-Qiao and Kuang Le-Man |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | cross-Kerr-like interaction circuit quantum electrodynamics macroscopic entangled state |
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