Parity-gate-based quantum information processing in decoherence-free subspace with nitrogen-vacancy centers

2015 ◽  
Vol 352 ◽  
pp. 140-147 ◽  
Author(s):  
Xiao-Ping Zhou ◽  
Shi-Lei Su ◽  
Qi Guo ◽  
Hong-Fu Wang ◽  
Ai-Dong Zhu ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Nitrogen Vacancy ◽  
Parity Gate ◽  
Nitrogen Vacancy Centers ◽  
Decoherence Free Subspace

Quantum-entanglement storage and extraction in quantum network node

2018 ◽  
Vol 16 (01) ◽  
pp. 1850009 ◽  
Author(s):  
ZhuoYu Shan ◽  
Yong Zhang
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Entanglement ◽  
Information Technologies ◽  
Quantum Information Processing ◽  
Bell State ◽  
Nitrogen Vacancy ◽  
Quantum Network ◽  
Nuclear Spins ◽  
Nv Centers

Quantum computing and quantum communication have become the most popular research topic. Nitrogen-vacancy (NV) centers in diamond have been shown the great advantage of implementing quantum information processing. The generation of entanglement between NV centers represents a fundamental prerequisite for all quantum information technologies. In this paper, we propose a scheme to realize the high-fidelity storage and extraction of quantum entanglement information based on the NV centers at room temperature. We store the entangled information of a pair of entangled photons in the Bell state into the nuclear spins of two NV centers, which can make these two NV centers entangled. And then we illuminate how to extract the entangled information from NV centers to prepare on-demand entangled states for optical quantum information processing. The strategy of engineering entanglement demonstrated here maybe pave the way towards a NV center-based quantum network.

scholarly journals Quantum reference beacon–guided superresolution optical focusing in complex media

Science ◽  
2019 ◽  
Vol 363 (6426) ◽  
pp. 528-531 ◽  
Author(s):  
Donggyu Kim ◽  
Dirk R. Englund
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Optical Excitation ◽  
Optical Scattering ◽  
Nitrogen Vacancy ◽  
Complex Media ◽  
Deep Tissue ◽  
Nitrogen Vacancy Centers ◽  
Wavefront Shaping ◽  
Optical Focusing

Optical scattering is generally considered to be a nuisance of microscopy that limits imaging depth and spatial resolution. Wavefront shaping techniques enable optical imaging at unprecedented depth, but attaining superresolution within complex media remains a challenge. We used a quantum reference beacon (QRB), consisting of solid-state quantum emitters with spin-dependent fluorescence, to provide subwavelength guidestar feedback for wavefront shaping to achieve a superresolution optical focus. We implemented the QRB-guided imaging with nitrogen-vacancy centers in diamond nanocrystals, which enable optical focusing with a subdiffraction resolution below 186 nanometers (less than half the wavelength). QRB-assisted wavefront-shaping should find use in a range of applications, including deep-tissue quantum enhanced sensing and individual optical excitation of magnetically coupled spin ensembles for applications in quantum information processing.

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