Volume 87, Number 4, August 2009
|Number of page(s)||6|
|Published online||07 September 2009|
Optimal control approach to dynamical suppression of decoherence of a qubit
LPMMC, C.N.R.S., Université Joseph Fourier - BP 166, 38042 Grenoble-cedex 9, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 28 July 2009
We investigate optimal control of a single qubit coupled to an ohmic heat bath. For the weak bath coupling regime, we derive a Bloch-Redfield master equation describing the evolution of the qubit state parameterized by vectors in the Bloch sphere. By use of the optimal control methodology, we determine a field that generates a single-qubit rotation. We use techniques of automatic differentiation to compute the gradient for the cost functional.
PACS: 02.30.Yy – Control theory / 03.67.-a – Quantum information / 03.65.Yz – Decoherence; open systems; quantum statistical methods
© EPLA, 2009
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