Dergiler / Turkish Journal of Physics / 2003 / Cilt: 27 - Sayı: 5
Mesoscopic d-Wave Qubits: Can High-Tc Cuprates Play a Role in Quantum Computing?
- Sayfa
- 491–511
- DOI
- —
Özet
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.
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.