Friday, October 19, 2012

1210.5151 (Ciprian Padurariu et al.)

Spin-blockade qubit in a superconducting junction    [PDF]

Ciprian Padurariu, Yuli V. Nazarov
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.
View original: http://arxiv.org/abs/1210.5151

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