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Two-qubit gates for decoherence-free qubits using a ring exchange interaction

Antonio, B; Bose, S; (2013) Two-qubit gates for decoherence-free qubits using a ring exchange interaction. Physical Review A , 88 (4) , Article ARTN 042306. 10.1103/PhysRevA.88.042306. Green open access

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Abstract

It is known that it is possible to encode a logical qubit over many physical qubits such that it is immune to the effects of collective decoherence, and it is possible to perform universal quantum computation using these “decoherence-free” qubits. However, current proposed methods of performing gates on these encoded qubits could be difficult to implement, or could take too much time to perform. Here we investigate whether exploiting ring exchange interactions, which may be naturally present, can simplify the implementation of these gates in any way. Using a ring exchange interaction, we have found a way to create a controlled-Z gate on the four-qubit decoherence-free subspace and the three-qubit decoherence-free subsystem using a sequence with five pulses. This could be useful in situations where simplicity is important or where ring exchange interactions are prominent. We also investigate how timing errors and magnetic field fluctuations affect the fidelity of this gate.

Type: Article
Title: Two-qubit gates for decoherence-free qubits using a ring exchange interaction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.88.042306
Publisher version: http://dx.doi.org/10.1103/PhysRevA.88.042306
Language: English
Additional information: ©2013 American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1415967
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