Volume 125, Number 1, January 2019
|Number of page(s)||7|
|Published online||06 February 2019|
Adiabatic speedup via zero-energy-change control in a spin system
1 Department of Physics, Ocean University of China - Qingdao 266100, China
2 College of Information and Control Engineering, Qingdao Technology University - Qingdao 266520, China
Received: 11 October 2018
Accepted: 4 January 2019
Adiabatic evolution is required in performing quantum information processing tasks and adiabatic speedup is often used to avoid decoherence problems for a long evolution time. Here, we add a leakage elimination operator (LEO) Hamiltonian to the evolution and adiabatic speedup can be obtained. LEO Hamiltonians can be realized by a sequence of periodic zero-energy-change pulses. By using the Feshbach partitioning technique, we obtain the exact control parameters to realize adiabatic speedup for different types of pulses. Furthermore, we show that this control scheme is fault-tolerant against pulse strength and pulse frequency for specified thresholds.
PACS: 03.65.-w – Quantum mechanics / 42.50.Dv – Quantum state engineering and measurements / 67.30.hj – Spin dynamics
© EPLA, 2019
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