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Experimental study of transmon type qubits coupled to a fast tunable transmission line resonator.

Martin Sandberg, Chris Wilson, Fredrik Persson +2 more

Bulletin of the American Physical SocietyMar 19, 20090 citations

Controllable preparation of two-mode entangled coherent states in circuit QED

Yinghua Ji, Yong-Mei Liu

Although the multi-level structure of superconducting qubits may result in calculation errors, it can be rationally used to effectively improve the speed of gate operations. Utilizing a current-biased Josephson junction (λ-type rf-SQUID) as a tunable coupler for superconducting transmission line resonators (TLRs), under the large detuning condition, we demonstrate the controllable generation of entangled coherent states in circuit quantum electrodynamics (circuit QED). The coupling between the TLRs and the qubit can be effectively regulated by an external bias current or coupling capacitor. Further investigations indicate that the maximum entangled state can be obtained through measuring the excited state of the superconducting qubits. Then, the influence of the TLR decay on the prepared entangled states is analyzed.Although the multi-level structure of superconducting qubits may result in calculation errors, it can be rationally used to effectively improve the speed of gate operations. Utilizing a current-biased Josephson junction (λ-type rf-SQUID) as a tunable coupler for superconducting transmission line resonators (TLRs), under the large detuning condition, we demonstrate the controllable generation of entangled coherent states in circuit quantum electrodynamics (circuit QED). The coupling between the TLRs and the qubit can be effectively regulated by an external bias current or coupling capacitor. Further investigations indicate that the maximum entangled state can be obtained through measuring the excited state of the superconducting qubits. Then, the influence of the TLR decay on the prepared entangled states is analyzed.

Chinese Physics BNov 1, 20145 citations

Transmon qubit coupled to a quasi-lumped element resonator

Baladitya Suri, S P Novikov, V. Zaretskey +2 more

Bulletin of the American Physical SocietyFeb 29, 20121 citation

Transmon qubits coupled to compact resonators

Shyam Shankar, K. Geerlings, E.V. Edwards +3 more

Bulletin of the American Physical SocietyMar 23, 20110 citations

A simple scheme to generate χ-type four-charge entangled states in circuit QED

Gui-Long Gao, Fuquan Song, Shou-Sheng Huang +4 more

We propose a simple scheme to generate χ-type four-charge entangled states by using SQUID-based charge qubits capacitively coupled to a transmission line resonator (TLR). The coupling between the superconducting qubit and the TLR can be effectively controlled by properly adjusting the control parameters of the charge qubit. The experimental feasibility of our scheme is also shown.

Chinese Physics BApr 1, 20127 citations

A simple scheme to generate χ-type four-charge entangled states in circuit QED

高贵龙, 宋付权, 黄寿胜 +4 more

We propose a simple scheme to generate χ-type four-charge entangled states by using SQUID-based charge qubits capacitively coupled to a transmission line resonator (TLR). The coupling between the superconducting qubit and the TLR can be effectively controlled by properly adjusting the control parameters of the charge qubit. The experimental feasibility of our scheme is also shown.

Chinese Physics BJan 1, 20120 citations

Circuit QED with a new type of qubit: The transmon coupled to a transmission line resonator

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Circuit QED with a new type of qubit: The transmon coupled to a transmission line resonator

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