Abstract
We present experimental results on the generation of multi-spatial-mode, single-beam, quadrature squeezed light using four-wave mixing in hot Rb vapor. Squeezing and phase-sensitive deamplification are observed over a range of powers and detunings near the (85)Rb D1 atomic transition. We observe -3 dB of vacuum quadrature squeezing, comparable to the best single-spatial mode results previously reported using atomic vapors, however, produced here in multiple spatial modes. We confirm that the squeezing is present in more than one transverse mode by studying the spatial distribution of the noise properties of the field.
Highlights
The generation of squeezed states of light has been a subject of research since its first experimental demonstration, using four-wave mixing (4WM) in sodium vapor, by Slusher et al [1]
We have found [21, 22] that 4WM in Rb atomic vapor can produce entangled twin beams with intensity-difference squeezing levels approaching the highest quadrature squeezing levels demonstrated with downconversion crystals in an optical parametric oscillators (OPOs)
We demonstrate that with proper choice of operating parameters this system can produce as much as (−3.0 ± 0.3) dB (−3.5 dB corrected for losses) of squeezing. (All uncertainties quoted in this paper are one standard deviation, combined statistical and systematic uncertainties.) Further, we show that multiple spatial modes are squeezed, making this source of interest for optical image processing
Summary
The generation of squeezed states of light has been a subject of research since its first experimental demonstration, using four-wave mixing (4WM) in sodium vapor, by Slusher et al [1]. Continuous-variable quantum computing applications need entangled states, either produced directly in the form of squeezed twin beams or by linear optical processing of single-beam quadrature squeezed states [5]. While a high level of squeezing is obviously desirable, additional considerations such as the type of squeezed state, squeezing bandwidth, and single/multi-spatial mode character of the state are considerations in evaluating the merits of different techniques for particular applications. We have found [21, 22] that 4WM in Rb atomic vapor can produce entangled twin beams with intensity-difference squeezing levels approaching the highest quadrature squeezing levels demonstrated with downconversion crystals in an OPO. The large non-linearity of the atomic vapor for near resonant light permits operation without a cavity This is a very attractive feature that makes performing operations on multiple spatial modes straightforward [23,24,25]. We have observed that the squeezing spectrum extends continuously to low frequencies (at least as low as 5 kHz, limited by technical noise in the present experiments)
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