High-fidelity spin measurement on the nitrogen-vacancy center

Michael Hanks; Michael Trupke; Jörg Schmiedmayer; William J Munro; Kae Nemoto

doi:10.1088/1367-2630/aa8085

Titel

High-fidelity spin measurement on the nitrogen-vacancy center

Autor*in

Michael Hanks

Department of Informatics, School of Multidisciplinary Sciences, Sokendai (The Graduate University for Advanced Studies)

Michael Trupke

Quantenoptik, Quantennanophysik und Quanteninformation, Fakultät für Physik, Universität Wien

Jörg Schmiedmayer

Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien

... show all

Abstract

Nitrogen-vacancy (NV) centers in diamond are versatile candidates for many quantum information processing tasks, ranging from quantum imaging and sensing through to quantum communication and fault-tolerant quantum computers. Critical to almost every potential application is an efficient mechanism for the high fidelity readout of the state of the electronic and nuclear spins. Typically such readout has been achieved through an optically resonant fluorescence measurement, but the presence of decay through a meta-stable state will limit its efficiency to the order of 99%. While this is good enough for many applications, it is insufficient for large scale quantum networks and fault-tolerant computational tasks. Here we explore an alternative approach based on dipole induced transparency (state-dependent reflection) in an NV center cavity QED system, using the most recent knowledge of the NV center's parameters to determine its feasibility, including the decay channels through the meta-stable subspace and photon ionization. We find that single-shot measurements above fault-tolerant thresholds should be available in the strong coupling regime for a wide range of cavity-center cooperativities, using a majority voting approach utilizing single photon detection. Furthermore, extremely high fidelity measurements are possible using weak optical pulses.

Stichwort

nitrogen vacancyquantum communicationquantum informationmeasurement

Objekt-Typ

journal article

Sprache

Englisch [eng]

Persistent identifier

phaidra.univie.ac.at/o:907597

DOI

10.1088/1367-2630/aa8085

Erschienen in

Titel