1205.1307 (Xiangkun Xu et al.)

Coherence-protected Quantum Gate by Continuous Dynamical Decoupling in
Diamond    [PDF]

Xiangkun Xu, Zixiang Wang, Changkui Duan, Pu Huang, Pengfei Wang, Ya Wang, Nanyang Xu, Xi Kong, Fazhan Shi, Xing Rong, Jiangfeng Du

To implement reliable quantum information processing, quantum gates have to be protected together with the qubits from decoherence. Here we demonstrate experimentally on nitrogen-vacancy system that by using continuous wave dynamical decoupling method, not only the coherence time is prolonged by about 20 times, but also the quantum gates is protected for the duration of controlling time. This protocol shares the merits of retaining the superiority of prolonging the coherence time and at the same time easily combining with quantum logic tasks. It is expected to be useful in task where duration of quantum controlling exceeds far beyond the dephasing time.

View original: http://arxiv.org/abs/1205.1307