Research

The Harvard Quantum Optics Center (HQOC) aims to foster research and education in quantum optical science. We support interdisciplinary research and educational activities in fundamental and applied sciences involving light-matter interactions, ultra-cold matter, quantum sensing, metrology, quantum control, and new, related interfaces with chemistry, biology, and information science. We also aid in the support of areas of condensed matter research that have some connection to quantum optics.

Probing Johnson noise and ballistic transport in normal metals with a single-spin qubit

S. Kolkowitz, A. Safira, A. A. High, R. C. Devlin, S. Choi, Q. P. Unterreithmeier, D. Patterson, A. S. Zibrov, V. E. Manucharyan, H. Park, and M. D. Lukin

In a recent experiment published in Science, we used atom-like defects in diamond called nitrogen-vacancy (NV) centers to probe the properties of magnetic field noise tens of nanometers away from the surface of silver samples...
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Quantum Optics in the Solid State with Diamond Nanophotonics

Nathalie de Leon, Kristiaan De Greve, Ruffin Evans, Michael Goldman, Alex High, Matthew Markham, Alistair Stacey, Daniel Twitchen, Marko Loncar, Hongkun Park, Mikhail Lukin

Large-scale quantum networks will require efficient interfaces between photons and stationary quantum bits. Nitrogen-vacancy (NV) centers in diamond are a promising candidate for quantum information processing because they are optically addressable, have spin degrees of freedom with long coherence times, and as solid-state entities, can be integrated into nanophotonic devices...
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photonic-crystals

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Coupling Diamond Color Centers to Superconducting Nanowire Single Photon Detectors

Haig A. Atikian, Srujan Meesala, Michael J. Burek, Jennifer T. Choy, Robert Westervelt and Marko Loncar

Diamond photonic devices are rapidly evolving where non-classical light emitted by diamond defect centers can be generated, manipulated, and detected on a monolithic platform. Superconducting nanowire single photon detectors (SNSPDs) are a class of cutting edge photon detectors that outperform other technologies on merits such as detection efficiency, dark counts, timing jitter, and maximum count rates...
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