Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 20: Transport: Quantum Coherence and Quantum Information Systems 3 (jointly with MA and HL)
TT 20.6: Talk
Tuesday, March 27, 2012, 11:30–11:45, BH 243
Spin-orbit-induced strong coupling of a single spin to a nanomechanical resonator — •Andras Palyi1,2, Philipp R. Struck1, Mark Rudner3, Karsten Flensberg3,4, and Guido Burkard1 — 1University of Konstanz, Germany — 2Eotvos University, Budapest, Hungary — 3Harvard University, Cambridge, Massachusetts, United States — 4Niels Bohr Institute, Copenhagen, Denmark
We theoretically investigate the coupling of electron spin to vibrational motion due to curvature-induced spin-orbit coupling in suspended carbon nanotube quantum dots. Our estimates indicate that, with current capabilities, a quantum dot with an odd number of electrons can serve as a realization of the Jaynes-Cummings model of quantum electrodynamics in the strong-coupling regime. A quantized flexural mode of the suspended tube plays the role of the optical mode and we identify two distinct two-level subspaces, at small and large magnetic field, which can be used as qubits in this setup. The strong intrinsic spin-mechanical coupling allows for detection, as well as manipulation of the spin qubit, and may yield enhanced performance of nanotubes in sensing applications [1].
arXiv:1110.4893)