Protecting solid-state spins from a strongly coupled environment
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-05-16 |
| Journal | New Journal of Physics |
| Authors | Mo Chen, Won Kyu Calvin Sun, Kasturi Saha, Jean-Christophe Jaskula, Paola Cappellaro |
| Citations | 15 |
Abstract
Section titled āAbstractāQuantum memories are critical for solid-state quantum computing devices and a\ngood quantum memory requires both long storage time and fast read/write\noperations. A promising system is the Nitrogen-Vacancy (NV) center in diamond,\nwhere the NV electronic spin serves as the computing qubit and a nearby nuclear\nspin as the memory qubit. Previous works used remote, weakly coupled $^{13}$C\nnuclear spins, trading read/write speed for long storage time. Here we focus\ninstead on the intrinsic strongly coupled $^{14}$N nuclear spin. We first\nquantitatively understand its decoherence mechanism, identifying as its source\nthe electronic spin that acts as a quantum fluctuator. We then propose a scheme\nto protect the quantum memory from the fluctuating noise by applying dynamical\ndecoupling on the environment itself. We demonstrate a factor of $3$\nenhancement of the storage time in a proof-of-principle experiment, showing the\npotential for a quantum memory that combines fast operation with long coherence\ntime.\n