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May 19th, 2010
Diamond nanotechnology
Abstract:
One exciting application at the forefront of diamond research is in quantum science. Nonclassical (single-photon) light sources based on individual color centers in diamond, most notably the nitrogen-vacancy (NV) center, have been used for secure communication based on quantum-cryptography protocols. Coupling between the NV center's electronic spin and nearby nuclear spins can be used to form a large qubit register, an essential ingredient for a quantum computer.
Recently, techniques designed to manipulate the NV center have been applied to nanoscale magnetic-field sensing based on single spins. But practical implementations of these technologies require efficient excitation and extraction of single photons from NV centers using a simple optical system. This is a challenge because of the high refractive index of the diamond host, so that the majority of photons emitted from an embedded color center are not accessible even to sophisticated setups.
Source:
spie.org
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