Continuous dynamical decoupling of a single diamond nitrogen-vacancy center spin with a mechanical resonator
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-12-14 |
| Journal | Physical Review B |
| Authors | E. R. MacQuarrie, Tanay A. Gosavi, Sunil A. Bhave, Gregory D. Fuchs |
| Institutions | Cornell University, Purdue University West Lafayette |
| Citations | 66 |
Abstract
Section titled āAbstractāInhomogeneous dephasing from uncontrolled environmental noise can limit the\ncoherence of a quantum sensor or qubit. For solid state spin qubits such as the\nnitrogen-vacancy (NV) center in diamond, a dominant source of environmental\nnoise is magnetic field fluctuations due to nearby paramagnetic impurities and\ninstabilities in a magnetic bias field. In this work, we use ac stress\ngenerated by a diamond mechanical resonator to engineer a dressed spin basis in\nwhich a single NV center qubit is less sensitive to its magnetic environment.\nFor a qubit in the thermally isolated subspace of this protected basis, we\nprolong the dephasing time $T_2^$ from $2.7\pm0.1$ $\mu$s to $15\pm1$ $\mu$s\nby dressing with a $\Omega=581\pm2$ kHz mechanical Rabi field. Furthermore, we\ndevelop a model that quantitatively predicts the relationship between $\Omega$\nand $T_2^$ in the dressed basis. Our model suggests that a combination of\nmagnetic field fluctuations and hyperfine coupling to nearby nuclear spins\nlimits the protected coherence time over the range of $\Omega$ accessed here.\nWe show that amplitude noise in $\Omega$ will dominate the dephasing for larger\ndriving fields.\n