Frequency modulated pulses for quantum bits coupled to time-dependent baths

Details Frequency modulated pulses for quantum bits coupled to time-dependent baths Frequency modulated pulses for quantum bits coupled to time-dependent baths

2011-12-02

arxiv.org/abs/1112.0446v2

Physical Review A 85, 022310 (2012)

Physics

Quantum Physics

10 pages, 6 figures

Scientific paper

10.1103/PhysRevA.85.022310

We consider the coherent control of a quantum bit by the use of short pulses with finite duration \tau_p. By shaping the pulse, we perturbatively decouple the dynamics of the bath from the dynamics of the quantum bit during the pulse. Such shaped pulses provide single quantum bit gates robust against decoherence which are useful for quantum information processing. We extend previous results in two ways: (i) we treat frequency modulated pulses and (ii) we pass from time-independent baths to analytically time-dependent baths. First and second order solutions for \pi- and \pi/2-pulses are presented. They are useful in experiments where amplitude modulation is difficult to realize.

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