Publications associated with Ultrafast quantum optics and optical metrology


Cavity-Enhanced Room-Temperature Broadband Raman Memory.

Physical review letters 116 (2016) 090501-

DJ Saunders, JHD Munns, TFM Champion, C Qiu, KT Kaczmarek, E Poem, PM Ledingham, IA Walmsley, J Nunn

Broadband quantum memories hold great promise as multiplexing elements in future photonic quantum information protocols. Alkali-vapor Raman memories combine high-bandwidth storage, on-demand readout, and operation at room temperature without collisional fluorescence noise. However, previous implementations have required large control pulse energies and have suffered from four-wave-mixing noise. Here, we present a Raman memory where the storage interaction is enhanced by a low-finesse birefringent cavity tuned into simultaneous resonance with the signal and control fields, dramatically reducing the energy required to drive the memory. By engineering antiresonance for the anti-Stokes field, we also suppress the four-wave-mixing noise and report the lowest unconditional noise floor yet achieved in a Raman-type warm vapor memory, (15±2)×10^{-3} photons per pulse, with a total efficiency of (9.5±0.5)%.


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