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.

Realizing a robust practical Majorana chain in a quantum-dot-superconductor linear array

Jay D. Sau, S. Das Sarma, Nat. Commun. 3:964 doi:
10.1038/ncomms1966 (2012).

Semiconducting nanowires in proximity to superconductors are promising experimental systems for realizing the elusive Majorana fermions, which, because of their non-Abelian anyonic braiding statistics, may ultimately be used as building blocks for topological quantum computers...
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ncomms1966-f1

Room-Temperature Quantum Bit Memory Exceeding One Second

P. C. Maurer, G. Kucsko, C. Latta, L. Jiang, N. Y. Yao, S. D. Bennett, F. Pastawski, D. Hunger, N. Chisholm, M. Markham, D. J. Twitchen, J. I. Cirac, M. D. Lukin, Science 8 June 2012: 1283-1286

Stable quantum bits, capable both of storing quantum information for macroscopic time scales and of integration inside small portable devices, are an essential building block for an array of potential applications. We demonstrate high-fidelity control of a solid-state qubit, which preserves its polarization for several minutes and features coherence lifetimes exceeding 1 second at room temperature...
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Lukin Quantum Bit

A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres

P. Maletinsky, S. Hong, M. S. Grinolds, B. Hausmann, M. D. Lukin, R. L. Walsworth, M. Loncar, A. Yacoby. Nature Nanotechnology 7, 320-324 (2012).

The exceptional spin-coherence of nitrogen-vacancy (NV) defect centers in diamond allows for extremely sensitive optical measurements of magnetic fields. By incorporating a single NV-defect into the tip of an atomic force microscope, the Yacoby, Lukin and Loncar groups at Harvard have realized a scanning magnetometer with nm-scale spatial resolution, operating at room temperature...
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NVAFM-figure_processed
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