title: Coherence-protected quantum gate by continuous dynamical decoupling in diamond.
abstract: In order to achieve reliable quantum-information processing results, we need to protect quantum gates along with the qubits from decoherence. Here we demonstrate experimentally on a nitrogen-vacancy system that by using a continuous-wave dynamical decoupling method, we might not only prolong the coherence time by about 20 times but also protect the quantum gates for the duration of the 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. This method can be useful in tasks where the duration of quantum controlling exceeds far beyond the dephasing time.
authors.affiliation: Hefei National Laboratory for Physics Sciences at Microscale, University of Science and Technology of China, China.
authors.forename: Xiangkun
authors.initials: X
authors.lastname: Xu
authors.forename: Zixiang
authors.initials: Z
authors.lastname: Wang
authors.forename: Changkui
authors.initials: C
authors.lastname: Duan
authors.forename: Pu
authors.initials: P
authors.lastname: Huang
authors.forename: Pengfei
authors.initials: P
authors.lastname: Wang
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.forename: Nanyang
authors.initials: N
authors.lastname: Xu
authors.forename: Xi
authors.initials: X
authors.lastname: Kong
authors.forename: Fazhan
authors.initials: F
authors.lastname: Shi
authors.forename: Xing
authors.initials: X
authors.lastname: Rong
authors.forename: Jiangfeng
authors.initials: J
authors.lastname: Du