Abstract
We present theoretical and experimental results on the generation and detection of pulsed, relative-intensity squeezed light in a hot 87Rb vapor. The intensity noise correlations between a pulsed probe beam and its conjugate, generated through nearly degenerate four-wave mixing in a double-lambda system, are studied numerically and measured experimentally via time-resolved balanced detection. We predict and observe approximately − 1 dB of time-resolved relative-intensity squeezing with 50 ns pulses at 1 MHz repetition rate. (− 1.34 dB corrected for loss).
Highlights
Squeezed light is a valuable resource in the fields of continuous-variable quantum information and quantum optics
A quantum memory, such as that based on the long-lived coherence of an atomic system [4], is a vital component for the implementation of a quantum repeater, which allows for the extension of the range of quantum communication networks [5]
It offers an alternative path to quantum memory experiments requiring pulsed nonclassical states of light, as well as other quantum information applications that require pulsed resonant non-Gaussian states of light
Summary
Squeezed light is a valuable resource in the fields of continuous-variable quantum information and quantum optics. Recent experiments have demonstrated that pulsed squeezed light can be de-Gaussified (via projective measurements) to produce exotic nonclassical states of light [14] (e.g. cat states) that allow for fundamental tests of quantum mechanics as well as continuous-variable quantum computing. The generation of squeezed vacuum in a single-pass geometry has mainly relied on ultrashort pulses in off-resonant systems (χ (2) crystals and optical fibers), which renders the bandwidth incompatible with the narrow linewidths of atomic and ionic systems As such systems allow for deterministic quantum optical operations besides serving as quantum memories, it is highly desirable to produce squeezed light over a narrow bandwidth as well as close to an atomic resonance. It offers an alternative path to quantum memory experiments requiring pulsed nonclassical states of light, as well as other quantum information applications that require pulsed resonant non-Gaussian states of light
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