GENERAL A Singlet State Generated with SQUIDs in Cavity QED

We propose a scheme to generate a three-quhit three-level singlet state in cavity QED, by placing three A-type SQUIDs in a single mode cavity. In this scheme, we make use of the interaction between the SQUIDs and cavity filed, and the classical pulses. The cavity fields are in vacuum state during the whole operation processes of creating the entanglement, and there is no quantum information transformation between the SQUIDs and cavity fields. Because of the advantage of the SQUID-cavity system, the quality factor of the cavity is greatly relaxed.

[1]  Chui-Ping Yang,et al.  Possible realization of entanglement, logical gates, and quantum-information transfer with superconducting-quantum-interference-device qubits in cavity QED , 2003, 1403.4037.

[2]  D. Bouwmeester,et al.  Stimulated emission of polarization-entangled photons , 2001, Nature.

[3]  Xiu-Min Lin,et al.  Generation of the singlet state for three atoms in cavity QED , 2007 .

[4]  Guang-Sheng Jin,et al.  Generation of a supersinglet of three three-level atoms in cavity QED , 2005 .

[5]  Mark Hillery,et al.  Singlet states and the estimation of eigenstates and eigenvalues of an unknown controlled- U gate , 2001 .

[6]  Jian Yang,et al.  Realization of universal quantum cloning with superconducting quantum-interference device qubits in a cavity , 2008 .

[7]  Lukens,et al.  Generation of a population inversion between quantum states of a macroscopic variable. , 1996, Physical review letters.

[8]  Chui-Ping Yang,et al.  Quantum information transfer and entanglement with SQUID qubits in cavity QED: a dark-state scheme with tolerance for nonuniform device parameter. , 2004, Physical review letters.

[9]  Antia Lamas-Linares,et al.  Experimental violation of a spin-1 bell inequality using maximally entangled four-photon states. , 2002, Physical review letters.

[10]  G. Guo,et al.  Quantum logic gate operation and entanglement with superconducting quantum interference devices in a cavity via a Raman transition , 2005 .

[11]  V. Buzek,et al.  Quantum secret sharing , 1998, quant-ph/9806063.

[12]  A. Cabello.  N-particle N-level singlet States: some properties and applications. , 2002, Physical review letters.