Temporal coherence of photons emitted by single nitrogen-vacancy defect centers in diamond using optical Rabi-oscillations.
Photon interference among distant quantum emitters is a promising method to generate large scale quantum networks. Interference is best achieved when photons show long coherence times. For the nitrogen-vacancy defect center in diamond we measure the coherence times of photons via optically induced Rabi oscillations. Experiments reveal a close to Fourier-transform (i.e., lifetime) limited width of photons emitted even when averaged over minutes. The projected contrast of two-photon interference (0.8) is high enough to envisage applications in quantum information processing. We report 12 and 7.8 ns excited state lifetimes depending on the spin state of the defect.
Batalov
A
A
3. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany.
Zierl
C
C
Gaebel
T
T
Neumann
P
P
Chan
I-Y
IY
Balasubramanian
G
G
Hemmer
P R
PR
Jelezko
F
F
Wrachtrup
J
J