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  1. Free, publicly-accessible full text available July 1, 2024
  2. Broadband quantum memory is critical to enabling the operation of emerging photonic quantum technology at high speeds. Here we review a central challenge to achieving broadband quantum memory in atomic ensembles—what we call the ‘linewidth-bandwidth mismatch’ problem—and the relative merits of various memory protocols and hardware used for accomplishing this task. We also review the theory underlying atomic ensemble quantum memory and its extensions to optimizing memory efficiency and characterizing memory sensitivity. Finally, we examine the state-of-the-art performance of broadband atomic ensemble quantum memories with respect to three key metrics: efficiency, memory lifetime, and noise. 
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    Free, publicly-accessible full text available June 1, 2024
  3. We measure 95.6±0.3% storage efficiency of ultrafast photons in a collisionally broadened barium vapor quantum memory. We measure 31±1% total efficiency, limited by control field power, and a 0.515(6) ns lifetime, limited by motional dephasing.

     
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  4. We demonstrate the underlying mechanism for one version of quantum-enhanced telescopy, using multiple interconnected Hong-Ou-Mandel interferometers to re-cover the visibility amplitude of the source of light in the presence of arbitrary turbulence. 
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  5. Shahriar, Selim M. ; Scheuer, Jacob (Ed.)
  6. We report results of very-long-baseline interferometric imaging using distributed single photons. We demonstrate source autocorrelation reconstruction, and increased signal-to-noise ratio per detected coincidence compared to using classical states as phase reference.

     
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  7. We connect the reference frame problem in astronomical interferometry to the concept of decoherence-free subspaces in quantum information. Inspired by this connection, a new scheme that does not rely on reference frame is proposed.

     
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