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Entangled States in a Josephson Charge Qubit Coupled to a Superconducting Resonator

O. Buisson, F. W. J. Hekking

arXiv:cond-mat/0008275Springer eBooksJan 1, 200125 citations

Disentanglement in a quantum-critical environment

Zhe Sun, Xiaoguang Wang, C. P. Sun

We study the dynamical process of disentanglement of two qubits and two qutrits coupled to an Ising spin chain in a transverse field, which exhibits a quantum phase transition. We use the concurrence and negativity to quantify entanglement of two qubits and two qutrits, respectively. Explicit connections between the concurrence (negativity) and the decoherence factors are given for two initial states, the pure maximally entangled state and the mixed Werner state. We find that the concurrence and negativity decay exponentially with fourth power of time in the vicinity of the critical point of the environmental system.We study the dynamical process of disentanglement of two qubits and two qutrits coupled to an Ising spin chain in a transverse field, which exhibits a quantum phase transition. We use the concurrence and negativity to quantify entanglement of two qubits and two qutrits, respectively. Explicit connections between the concurrence (negativity) and the decoherence factors are given for two initial states, the pure maximally entangled state and the mixed Werner state. We find that the concurrence and negativity decay exponentially with fourth power of time in the vicinity of the critical point of the environmental system.

arXiv:0704.1172Physical Review AJun 11, 2007130 citations

PROBING ENTANGLEMENT IN THE SYSTEM OF COUPLED JOSEPHSON QUBITS

А. S. Kiyko, A. N. Omelyanchouk, Sergey N Shevchenko

International Symposium on Mesoscopic Superconductivity and Spintronics (MS+S)Oct 1, 20080 citations

Generation of Three-Qubit Entanglement Using Josephson Phase Qubits

M. Neeley

Jan 1, 20105 citations

Coupling two charge qubits

Yu. A. Pashkin, Tsuyoshi Yamamoto, O. V. Astafiev +3 more

We demonstrate a Josephson circuit consisting of two electrostatically coupled charge quantum bits (qubits). Using a pulse technique, we coherently mix quantum states and observe quantum oscillation, the spectrum of which reflects interaction between the qubits. Our results demonstrate feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.

Nec Research & DevelopmentJul 1, 20031 citation

Maximally entangled symmetric states of two qubits

Eduardo Serrano-Ensástiga, John Martin

Jan 1, 20230 citations

Synthesis of maximally entangled mixed states and disentanglement in coupled Josephson charge qubits

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