Physics – Quantum Physics
Scientific paper
2005-02-03
Phys. Rev. Lett. 95, 037202 (2005)
Physics
Quantum Physics
4 pages, 2 tables. (modified first table, references added, minor text changes)
Scientific paper
10.1103/PhysRevLett.95.037202
We present a scalable scheme to design optimized soft pulses and pulse sequences for coherent control of interacting quantum many-body systems. The scheme is based on the cluster expansion and the time dependent perturbation theory implemented numerically. This approach offers a dramatic advantage in numerical efficiency, and it is also more convenient than the commonly used Magnus expansion, especially when dealing with higher order terms. We illustrate the scheme by designing 2nd-order pi-pulses and a 6th-order 8-pulse refocusing sequence for a chain of qubits with nearest-neighbor couplings. We also discuss the performance of soft-pulse refocusing sequences in suppressing decoherence due to low-frequency environment.
Pryadko Leonid P.
Sengupta Pinaki
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