title: Quantum interference of single photons from remote nitrogen-vacancy centers in diamond.
abstract: We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy centers in distinct diamond samples separated by two meters. Macroscopic solid immersion lenses are used to enhance photon collection efficiency. Quantum interference is verified by measuring a value of the second-order cross-correlation function g((2))(0)=0.35±0.04<0.5. In addition, optical transition frequencies of two separated nitrogen-vacancy centers are tuned into resonance with each other by applying external electric fields. An extension of the present approach to generate entanglement of remote solid-state qubits is discussed.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: A
authors.initials: A
authors.lastname: Sipahigil
authors.forename: M L
authors.initials: ML
authors.lastname: Goldman
authors.forename: E
authors.initials: E
authors.lastname: Togan
authors.forename: Y
authors.initials: Y
authors.lastname: Chu
authors.forename: M
authors.initials: M
authors.lastname: Markham
authors.forename: D J
authors.initials: DJ
authors.lastname: Twitchen
authors.forename: A S
authors.initials: AS
authors.lastname: Zibrov
authors.forename: A
authors.initials: A
authors.lastname: Kubanek
authors.forename: M D
authors.initials: MD
authors.lastname: Lukin