title: Quantum coherence in a one-electron semiconductor charge qubit.
abstract: We study quantum coherence in a semiconductor charge qubit formed from a GaAs double quantum dot containing a single electron. Voltage pulses are applied to depletion gates to drive qubit rotations and noninvasive state readout is achieved using a quantum point contact charge detector. We measure a maximum coherence time of ∼7 ns at the charge degeneracy point, where the qubit level splitting is first-order insensitive to gate voltage fluctuations. We compare measurements of the coherence time as a function of detuning with numerical simulations and predictions from a 1/f noise model.
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: K D
authors.initials: KD
authors.lastname: Petersson
authors.forename: J R
authors.initials: JR
authors.lastname: Petta
authors.forename: H
authors.initials: H
authors.lastname: Lu
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard