Quantum computation and W -state generation using superconducting flux qubits coupled to a cavity without geometric and dynamical manipulation

Based on superconducting quantum interference devices (SQUID's) coupled to a cavity, we propose a scheme for implementing a quantum phase-shift gate and generating a W state by an adiabatic evolution of dark eigenstates, without any contributions from dynamical and geometric gates. The Sole req...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-03, Vol.75 (3), Article 032347
Main Authors: Song, Ke-Hui, Xiang, Shao-Hua, Liu, Qiong, Lu, De-Hua
Format: Article
Language:English
Subjects:
ADIABATIC APPROXIMATION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EIGENSTATES
MICROWAVE RADIATION
PHASE SHIFT
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS
SQUID DEVICES
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Summary:Based on superconducting quantum interference devices (SQUID's) coupled to a cavity, we propose a scheme for implementing a quantum phase-shift gate and generating a W state by an adiabatic evolution of dark eigenstates, without any contributions from dynamical and geometric gates. The Sole requirement is of adiabatically increasing or decreasing Rabi frequencies of classical microwave pluses. Thus, the manipulation is robust against certain types of errors. We also analyze the experimental possibility that identical coupling can be achieved between SQUID qubits and cavity fields, and the cavity decay can be ignored in certain conditions. Based on a simple operation, our scheme may be realized in this solid-state system.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.75.032347