Turkish Journal of PhysicsMesoscopic d-Wave Qubits: Can High-Tc Cuprates Play a Role in Quantum Computing?
D-Wave Systems Inc., 320-1985 W Broadway, Vancouver, B.C., V6J 4Y3, CANADA,
Physics and Astronomy Dept., The University of British Columbia,
6224 Agricultural Rd., Vancouver, B.C., V6T 1Z1, CANADA.
Abstract: Due to nontrivial orbital pairing symmetry, surfaces and interfaces of high-Tc superconductors support states which violate time-reversal (T-) symmetry. Such naturally degenerate states, useful as working states of a qubit, are standard for atomic or molecular-size qubit prototypes (e.g. based on nuclear spins), but exceptional for mesoscopic qubits. (In particular, they hold promise of a better scalability.) In these lectures I review the physics of T-breaking on surfaces and interfaces of high-Tc superconductors; then describe existing proposals for high-Tc based qubits and the current state of experiments; finally, I discuss the decoherence sources in the system, open questions, and future research directions.
Key Words: high-Tc, Josephson, T-breaking, d-wave, qubit, decoherence, design, scalability
Turk. J. Phys., 27, (2003), 491-512.
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