Generation of a three-qudit GHZ state with diamond defect spins
Université Denis Diderot, Sorbonne Paris Cité, MPQ, UMR 7162 CNRS - F-75205 Paris, France
Received: 8 February 2016
Accepted: 29 July 2016
Diamond defect spins have emerged as potential qudits (d-dimensional quantum bit) in quantum information and quantum computing. A new scheme is proposed for realizing entangled states of GHZ (Greenberger-Horne-Zeilinger) class in a 3-qudit solid-state register. The qudits are the electron spin-1 carried by the negatively charged nitrogen-vacancy color center (NV−1) in diamond and the nuclear spin- of two carbon-13 impurities in the first neighbour shell. Multipartite entanglements between qudits are obtained by bringing the spin system in the vicinity of a level anticrossing. The degree of entanglement between all three qudits is quantified rigorously. GHZ and GHZ-like entangled states have applications in quantum communication and computation protocols.
PACS: 81.05.U- – Carbon/carbon-based materials / 61.72.jn – Color centers / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)
© EPLA, 2016