Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Quantum Coherence, Quantum Information Systems 1

TT 37.9: Talk

Wednesday, March 13, 2013, 11:45–12:00, H19

Decoherence of a central spin coupled to a fluctuating spin bath — •Alexandre Faribault and Dirk Schuricht — Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA - Fundamentals of Future Information Technology, 52056 Aachen, Germany

When using the spin of a single electron trapped in a quantum dot as an implementation of a qubit, its hyperfine coupling to the environmental nuclear spins ultimately leads to the decoherence of any prepared state. Using the Algebraic Bethe Ansatz in conjunction with a Monte Carlo sampling procedure, we study how the electron's spin coherence factor evolves with time due to the presence of an unprepared randomly fluctuating nuclear spin bath.