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Amplitude-squeezed Light

Author: the photonics expert (RP)

Definition: light with an intensity noise below the shot noise level

Category: article belongs to category quantum photonics quantum photonics

Related: squeezed states of lightshot noisestandard quantum limit

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DOI: 10.61835/8pj   Cite the article: BibTex BibLaTex plain textHTML   Link to this page!   LinkedIn

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What is Amplitude-squeezed Light?

Amplitude-squeezed light is light with an intensity noise level below the shot noise level, i.e. below the standard quantum limit. That reduced intensity noise can be obtained only at the expense of increased phase noise. In a phase space representation (see Figure 1), the uncertainty region becomes squeezed in the sense that it becomes narrower in the amplitude direction and wider in the phase direction. This is one form of squeezed states of light.

Generation of Amplitude-squeezed Light
amplitude-squeezed light
Figure 1: Phase space representation of amplitude-squeezed light.

Amplitude-squeezed light can be generated in different ways. One possibility is to drive a laser diode, held at a cryogenic temperature, with a very quiet electric current [4, 7]. In other cases, optical nonlinearities are exploited. For example, amplitude-squeezed light can be generated in a doubly resonant [5, 6] or singly resonant [8] frequency doubler.

Frequently Asked Questions

This FAQ section was generated with AI based on the article content and has been reviewed by the article’s author (RP).

What is amplitude-squeezed light?

Amplitude-squeezed light is light with an intensity noise level below the standard quantum limit, also known as the shot noise level. This reduction in amplitude noise comes at the cost of increased phase noise.

How can amplitude-squeezed light be generated?

It can be generated by driving a laser diode at cryogenic temperatures with a very quiet electric current. Another method uses optical nonlinearities, for example in a singly or doubly resonant frequency doubler.

Suppliers

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Our Squeeze Laser generates a squeezed vacuum state with 10 dB noise reduction. The output in the high-quality TEM00 mode ensures optimal coupling to a downstream setup. The laser is available at both 1550 nm and 1064 nm. Optional control fields and electronics allow for seamless stabilization and control of the experimental setup. Visit our website to learn more and see how our technology can support your research.

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⚙ hardware
squeezed light sources from AdvR Applied Photonics

Utilizing highly efficient, low loss waveguides, our squeezed light sources deliver exceptional performance for quantum applications.

These type-0 single-pass SPDC devices achieve 3 dB of squeezing at 1550 nm when pumped with a 775 nm CW laser and are characterized to customer specific requirements.

Why choose our squeezed light sources?

  • Compact design
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Bibliography

[1]D. Walls, “Squeezed states of light”, Nature 306, 141 (1983); doi:10.1038/306141a0
[2]Y. Yamamoto et al., “Amplitude squeezing in a pump-noise-suppressed laser oscillator”, Phys. Rev. A 34 (5), 4025 (1986); doi:10.1103/PhysRevA.34.4025
[3]H. J. Kimble and D. Walls (eds.), Special Issue on squeezed light, J. Opt. Soc. Am B 4 (10) (1987)
[4]S. Machida et al., “Observation of amplitude squeezing in a constant-current-driven semiconductor laser”, Phys. Rev. Lett. 58 (10), 1000 (1987); doi:10.1103/PhysRevLett.58.1000
[5]S. F. Pereira et al., “Generation of squeezed light by intracavity frequency doubling”, Phys. Rev. A 38 (9), 4931 (1988); doi:10.1103/PhysRevA.38.4931
[6]A. Sizmann et al., “Observation of amplitude squeezing of the up-converted mode in second harmonic generation”, Opt. Commun. 80 (2), 138 (1990); doi:10.1016/0030-4018(90)90375-4
[7]W. H. Richardson et al., “Squeezed photon-number noise and sub-Poissonian electrical partition noise in a semiconductor laser”, Phys. Rev. Lett. 66 (22), 2867 (1991); doi:10.1103/PhysRevLett.66.2867
[8]R. Paschotta et al., “Bright squeezed light from a singly-resonant frequency doubler”, Phys. Rev. Lett. 72 (24), 3807 (1994); doi:10.1103/PhysRevLett.72.3807

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