Spin blockade qubit in a superconducting junction
Kavli Institute of NanoScience, Delft University of Technology - Lorentzweg 1, 2628 CJ, Delft, The Netherlands, EU
Received: 18 October 2012
Accepted: 20 November 2012
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.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 74.50.+r – Tunneling phenomena; Josephson effects / 73.63.-b – Electronic transport in nanoscale materials and structures
© EPLA, 2012