Theory of soliton-based control of coupled superconducting phase qubits

A simple scheme for controlling the gate operation for qubit-qubit interactions in superconducting phase qubits using a moving fluxon is proposed. The basic unit of our scheme is composed of three capacitively coupled flux-biased phase qubits. One of the qubits acts as a switch connecting the other...

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Bibliographic Details
Published in:Solid state sciences 2009-05, Vol.11 (5), p.942-944
Main Authors: MATSUO, Shigemasa, FURUTA, Kanoko, FUJII, Toshiyuki, NAGAI, Katsuhiko, HATAKENAKA, Noriyuki
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Physics
Quantum computation
Quantum information
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Summary:A simple scheme for controlling the gate operation for qubit-qubit interactions in superconducting phase qubits using a moving fluxon is proposed. The basic unit of our scheme is composed of three capacitively coupled flux-biased phase qubits. One of the qubits acts as a switch connecting the other two (two logical qubits) with an identical energy separation. The fluxon controls the energy separation of the switch qubit via its inductive coupling, leading to the resonance among qubits appropriately adjusting the fluxon velocity. As a result, the resonance is capable of performing a gate operation between two logical qubits. In addition, we show that this provides a simple scheme for generating entangled states of many qubits in solid-state quantum nanocircuits.
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2008.05.021