2012/12/31 by Jingfu Zhang, Jeong Hyun Shim, Ingo Niemeyer +8 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.110.240501
published as Phys. Rev. Lett. 110, 240501 (2013)
arxiv created 2013/06/13 · arxiv updated 2013/06/14
Quantum adiabatic passages can be greatly accelerated by a suitable control field, called a counter-diabatic field, which varies during the scan through resonance. Here, we implement this technique on the electron spin of a single nitrogen-vacancy center in diamond. We demonstrate two versions of this scheme. The first follows closely the procedure originally proposed by Demirplak and Rice (J. Phys. Chem. A 107, 9937 (2003)). In the second scheme, we use a control field whose amplitude is constant, but its phase varies with time. This version, which we call the rapid-scan approach, allows an even faster passage through resonance and therefore makes it applicable also for systems with shorter decoherence times.