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.

Magnetic Resonance Detection of Individual Proton Spins Using Quantum Reporters

Sushkov, A. O., Lovchinsky, I., Chisholm, N., Walsworth, R. L., Park, H., Lukin, M. D.

We demonstrate a method of magnetic resonance imaging with single nuclear-spin sensitivity under ambient conditions. Our method employs isolated electronic-spin quantum bits (qubits) as magnetic resonance “reporters” on the surface of high purity diamond...
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Article

Designer molecules through many-body physics

Sarang Gopalakrishnan, Colin V. Parker, and Eugene Demler
Phys. Rev. Lett. 114, 045301 – Published 28 January 2015

Correlated states of matter, from superconductors to quantum Hall fluids, host quasiparticles with exotic dispersion relations, interactions, and exchange statistics. These quasiparticles are usually excitations, but can exist even in the ground state at impurities and edges...
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Interferometric Probes of Many-body Localization

M. Serbyn, M. Knap, S. Gopalakrishnan, Z. Papić, N.Y. Yao, C.R. Laumann, D.A. Abanin, M.D. Lukin, and E.A. Demler
Phys. Rev. Lett. 113, 147204 – Published 3 October 2014

Isolated, disordered quantum systems exhibit a many-body localized (MBL) phase, in which interactions are unable to establish local thermal equilibrium; thus, the MBL phase is not described by equilibrium statistical mechanics...
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