High-fidelity spin measurement on the nitrogen-vacancy center
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-10-03 |
| Journal | New Journal of Physics |
| Authors | Michael Hanks, Michael Trupke, Jƶrg Schmiedmayer, William J. Munro, Kae Nemoto |
| Institutions | NTT Basic Research Laboratories, Vienna Center for Quantum Science and Technology |
| Citations | 17 |
Abstract
Section titled āAbstractāNitrogen-vacancy (NV) centers in diamond are versatile candidates for many\nquantum information processing tasks, ranging from quantum imaging and sensing\nthrough to quantum communication and fault-tolerant quantum computers. Critical\nto almost every potential application is an efficient mechanism for the high\nfidelity readout of the state of the electronic and nuclear spins. Typically\nsuch readout has been achieved through an optically resonant fluorescence\nmeasurement, but the presence of decay through a meta-stable state will limit\nits efficiency to the order of 99%. While this is good enough for many\napplications, it is insufficient for large scale quantum networks and\nfault-tolerant computational tasks. Here we explore an alternative approach\nbased on dipole induced transparency (state-dependent reflection) in an NV\ncenter cavity QED system, using the most recent knowledge of the NV centerās\nparameters to determine its feasibility, including the decay channels through\nthe meta-stable subspace and photon ionization. We find that single-shot\nmeasurements above fault-tolerant thresholds should be available in the strong\ncoupling regime for a wide range of cavity-center cooperativities, using a\nmajority voting approach utilizing single photon detection. Furthermore,\nextremely high fidelity measurements are possible using weak optical pulses.\n