Spin-blockade qubit in a superconducting junction

Abstract

We interpret a recent pioneering experiment [Zgirski M. et al., Phys. Rev. Lett., 106 (2011) 257003] on quasiparticle manipulation in a superconducting break junction in terms of spin blockade drawing analogy with spin qubits. We propose a novel qubit design that exploits the spin state of two trapped quasiparticles. We detail the coherent control of all four spin states by resonant quantum manipulation and compute the corresponding Rabi frequencies. The read-out technique is based on the spin-blockade that inhibits quasiparticle recombination in triplet states. We provide extensive microscopic estimations of the parameters of our model.

6 pages, 4 figures

References in corpus (1)

• Single-shot read-out of an individual electron spin in a quantum dot

Cited by in corpus (4)

• Single fermion manipulation via superconducting phase differences in multiterminal Josephson junctions
• Quench dynamics in superconducting nanojunctions: metastability and dynamical Yang-Lee zeros
• Quasiparticle trapping, Andreev level population dynamics, and charge imbalance in superconducting weak links
• Superconducting atomic contacts inductively coupled to a microwave resonator