Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-12-19
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 8 figures
Scientific paper
We propose and theoretically investigate spin superconducting qubits. Spin superconducting qubit consists of a single spin confined in a Josephson junction. We show that owing to spin-orbit interaction, superconducting difference across the junction can polarize this spin. We demonstrate that this enables single qubit operations and more complicated quantum gates, where spins of different qubits interact via a mutual inductance of superconducting loop where the junctions are embedded. Recent experimental realizations of Josephson junctions made of semiconductor quantum dots in contact with superconducting leads have shown that the number of electrons in the quantum dot can be tuned by a gate voltage. Spin superconducting qubit is realized when the number of electrons is odd. We discuss the qubit properties at phenomenological level. We present a microscopic theory that enables us to make accurate estimations of the qubit parameters by evaluating the spin-dependent Josephson energy in the framework of fourth-order perturbation theory.
Nazarov Yu. V.
Padurariu Ciprian
No associations
LandOfFree
Superconducting Spin Qubits does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Superconducting Spin Qubits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconducting Spin Qubits will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-382044