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.

Strongly Correlated Quantum Walks in Optical Lattices

Philipp M. Preiss, Ruichao Ma, M. Eric Tai, Alexander Lukin, Matthew
Rispoli, Philip Zupancic, Yoav Lahini, Rajibul Islam, and Markus Greiner

Full control over the dynamics of interacting, indistinguishable quantum particles is an important prerequisite for the experimental study of strongly correlated quantum matter and the implementation of high- delity quantum information processing...
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Multimode phase-matched third-harmonic generation in sub-micrometer-wide anatase TiO2 waveguides

Christopher C. Evans, Katia Shtyrkova, Orad Reshef, Michael Moebius, Jonathan D. B. Bradley, Sarah Griesse-Nascimento, Erich Ippen, and Eric Mazur

Third-harmonic generation (THG) has applications ranging from wavelength conversion to pulse characterization, and has important implications for quantum sources of entangled photons. However, on-chip THG devices are nearly unexplored because bulk techniques are difficult to adapt to integrated photonic circuits...
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Dissipative phase transitions: Independent versus collective decay and spin squeezing

Tony E. Lee, Ching-Kit Chan, Susanne F. Yelin

We study the XY model with infinite-range interactions (Lipkin-Meshkov-Glick model) in the presence of dissipation from spontaneous decay. We show that independent and collective decay lead to qualitatively different phase transitions of the steady state, even though the phase boundary is the same...
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