A diamond nanowire single-photon source.
The development of a robust light source that emits one photon at a time will allow new technologies such as secure communication through quantum cryptography. Devices based on fluorescent dye molecules, quantum dots and carbon nanotubes have been demonstrated, but none has combined a high single-photon flux with stable, room-temperature operation. Luminescent centres in diamond have recently emerged as a stable alternative, and, in the case of nitrogen-vacancy centres, offer spin quantum bits with optical readout. However, these luminescent centres in bulk diamond crystals have the disadvantage of low photon out-coupling. Here, we demonstrate a single-photon source composed of a nitrogen-vacancy centre in a diamond nanowire, which produces ten times greater flux than bulk diamond devices, while using ten times less power. This result enables a new class of devices for photonic and quantum information processing based on nanostructured diamond, and could have a broader impact in nanoelectromechanical systems, sensing and scanning probe microscopy.
School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA.
Thomas M
TM
Babinec
Birgit J M
BJ
Hausmann
Mughees
M
Khan
Yinan
Y
Zhang
Jeronimo R
JR
Maze
Philip R
PR
Hemmer
Marko
M
Loncar