Quantum entanglement and control in a capacitively coupled charge qubit circuit

doi:10.1088/1674-1056/19/1/010315

Abstract The macroscopic quantum entanglement in capacitively coupled SQUID (superconducting quantum interference device)-based charge qubits is investigated theoretically. The entanglement characteristic is discussed by employing the quantum Rabi oscillations and the concurrence. An interesting conclusion is obtained, i.e., the magnetic fluxes $\varPhi_{x1}$ and $\varPhi_{x2}$ through the superconducting loops can adjust the entanglement degree between the qubits.

Keywords: magnetic flux Josephson junction charge qubit entanglement

Received: 13 February 2009
Revised: 11 April 2009
Accepted manuscript online:

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	85.25.Cp	(Josephson devices)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10574060), the Natural Science Foundation of Shandong Province, China (Grant No. Y2008A23), and Project of Shandong Province Higher Educational Science and Technology Program (Grant No.~J09LA07).

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Liang Bao-Long(梁宝龙), Wang Ji-Suo(王继锁), Meng Xiang-Guo(孟祥国), and Su Jie(苏杰) Quantum entanglement and control in a capacitively coupled charge qubit circuit 2010 Chin. Phys. B 19 010315

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Quantum entanglement and control in a capacitively coupled charge qubit circuit

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