https://doi.org/10.1140/epjd/e2009-00224-4
Quantum computation in a decoherence-free subspace with superconducting devices
1
Department of Physics and Center of Theoretical and
Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
2
Laboratory of Quantum Information Technology, ICMP and
SPTE, South China Normal University, 510006, Guangzhou, P.R. China
Corresponding author: a xuezhengyuan@yahoo.com.cn
Received:
4
March
2009
Revised:
27
April
2009
Published online:
7
August
2009
We propose a scheme to implement quantum computation in decoherence-free subspace with superconducting devices inside a cavity by unconventional geometric manipulation. Universal single-qubit gates in encoded qubit can be achieved with cavity assisted interaction. A measurement-based two-qubit Controlled-Not gate is produced with parity measurements assisted by an auxiliary superconducting device and followed by prescribed single-qubit gates. The measurement of currents on two parallel devices can realize a projective measurement, which is equivalent to the parity measurement on the involved devices.
PACS: 03.67.Lx – Quantum computation architectures and implementations / 42.50.Dv – Quantum state engineering and measurements / 85.25.Cp – Josephson devices
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
