Abstract
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.
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In order to avoid confusion, we use “qubit” to denote the encoded logical qubit, while “device” for the superconducting charge qubit schemeticed in Figure [SEE TEXT] through out this paper.
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Xue, ZY., Zhu, S. & Wang, Z. Quantum computation in a decoherence-free subspace with superconducting devices. Eur. Phys. J. D 55, 223–228 (2009). https://doi.org/10.1140/epjd/e2009-00224-4
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DOI: https://doi.org/10.1140/epjd/e2009-00224-4