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TIME AND SPACE
Unpolarized single-photon generation with true randomness from diamond
by Staff Writers
Sendai, Japan (SPX) May 16, 2017


Schematic picture of unpolarized single-photon generation using a compound defect, a nitrogen vacancy center (NV center), in a diamond. Spheres, designated N and V respectively, indicate a nitrogen atom and a vacancy which comprises an NV center in the diamond lattice. Dynamically and statically unpolarized single-photon emission is induced by laser excitation for a [111]-oriented NV center in (111) diamond. Credit Naofumi Abe

The Tohoku University research group of Professor Keiichi Edamatsu and Postdoctoral fellow Naofumi Abe has demonstrated dynamically and statically unpolarized single-photon generation using diamond. This result is expected to play a crucial role in hardware random number generation using single photons (quantum dice or quantum coin toss), quantum cryptography and the testing of fundamental problems in quantum mechanics.

Quantum information technology, such as quantum computing and quantum cryptography, has the potential to exceed classical information technology in security and capability. In quantum information technology, single photons play an especially important role.

A unit of quantum information is a quantum bit or qubit. It is a two-state quantum-mechanical system, such as the polarization of a single photon. Conventional research had been focused on the generation of single photons in pure polarization states. But now, the team from Tohoku University has, for the first time, generated single photons in random polarization states.

In their paper, published in Scientic Reports, the authors present the first demonstration that single-photon emission from a specially oriented compound defect (a nitrogen vacancy center) in diamond is dynamically and statically unpolarized with intrinsic randomness.

Research paper

TIME AND SPACE
Elusive atomic motion captured by electron microscopy
Linkoping, Sweden (SPX) May 16, 2017
The movement of atoms through a material can cause problems under certain circumstances. Atomic-resolution electron microscopy has enabled researchers at Linkoping University in Sweden to observe for the first time a phenomenon that has eluded materials scientists for many decades. The study is published in Scientific Reports. In some contexts, it is extremely important that boundaries are ... read more

Related Links
Tohoku University
Understanding Time and Space

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