Atomic Resonant Single-Mode Squeezed Light from Four-Wave Mixing through Feedforward

Abstract

Squeezed states of light have received renewed attention due to their applicability to quantum-enhanced sensing. To take full advantage of their reduced noise properties to enhance atomic-based sensors, it is necessary to generate narrowband near or on atomic resonance single-mode squeezed states of light. We have previously generated bright two-mode squeezed states of light, or twin beams, that can be tuned to resonance with the D1 line of ${}^{87}$Rb with a non-degenerate four-wave mixing (FWM) process in a double-lambda configuration in a ${}^{85}$Rb vapor cell. Here we report on the use of feedforward to transfer the amplitude quantum correlations present in the twin beams to a single beam for the generation of single-mode amplitude squeezed light. With this technique we obtain a single-mode squeezed state with a squeezing level of $-2.9\pm 0.1$ dB when it is tuned off-resonance and a level of $-2.0\pm 0.1$ dB when it is tuned on resonance with the D1 $F=2$ to $F^{\prime }=2$ transition of ${}^{87}$Rb.

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Cited by in corpus (4)

• Hot atomic vapors for nonlinear and quantum optics
• Degenerate four-wave mixing as a low-power source of squeezed light
• Hexapartite steering based on a four-wave-mixing process with a spatially structured pump
• Quantum enhanced distributed phase sensing with a truncated SU(1,1) interferometer