| Autor: |
Saunders DJ; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Munns JH; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.; QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom., Champion TF; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Qiu C; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.; Department of Physics, Quantum Institute for Light and Atoms, State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China., Kaczmarek KT; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Poem E; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Ledingham PM; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Walmsley IA; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom., Nunn J; Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom. |
| Abstrakt: |
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)%. |
