Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Optical pumping with nonclassical light

A. S. Parkins

Published Apr 1, 1996• 9 citations
Publisher

Abstract

Optical pumping between ground states of a multilevel atom with low-intensity finite-bandwidth squeezed light is shown to exhibit significant qualitative and quantitative differences in behavior in comparison with optical pumping by standard classical light sources. \textcopyright{} 1996 The American Physical Society.
DOI
10.1103/physreva.53.2893

Related papers

Interaction of a two-level atom with a squeezed vacuum: Photon statistics and spectra

Perry R. Rice, Christopher A. Baird

We consider the interaction of a two-level atom with a squeezed vacuum, both in free space and in a cavity of moderate Q. In the latter case, only vacuum modes coupled to the cavity are squeezed. In both cases we calculate the following quantities for the fluorescent light fields: the second-order intensity correlation function ${\mathit{g}}^{(2)}$(\ensuremath{\tau}), the spectrum of squeezing, the coherent spectrum, and the spectrum obtained in a pump-probe absorption measurement. Nonclassical behavior is discussed and comparison to an ordinary vacuum and thermal fields is made. \textcopyright{} 1996 The American Physical Society.

Physical Review A•May 1, 1996•27 citations

Squeezed light from conventionally pumped multilevel lasers

Timothy C. Ralph, Craig M. Savage

We calculate amplitude squeezing spectra for the light from a variety of conventionally pumped three- and four-level lasers. Hence we extend a recent prediction that a certain three-level laser can generate nonclassical light without the need for rigged pumping.

Optics Letters•Jul 15, 1991•50 citations

Ultrafast quantum optics

Ian A. Walmsley

Ultrashort light pulses play an important role in the generation, manipulation and characterization of nonclassical light. Nonclassical light is often generated from a classical pump beam using a nonlinear optical process. One might expect that the high peak intensity of ultrashort pulses would provide the necessary driver for such processes, and this is indeed the case. Ultrashort pulses have been used to generate squeezed states, and quadrature entangled states via three and four wave mixing, photon number states, polarization and frequency or directional entangled photon pairs states via three wave mixing.

Conference on Lasers and Electro-Optics•Jan 1, 2005•0 citations

Atom-Mediated Nonlinear Sources of Quantum Light

Aleksa Krstić, Priyanshu Tiwari, Frank Setzpfandt +2 more

Sources of highly nonclassical light are important building blocks of many proposed implementations of optical quantum technologies [1]. The most common realisations of nonclassical light sources are either based on two-level quantum emitters or on nonlinear sources of photon pairs and squeezed light [2] and are generally limited in the properties of the quantum states of light they can efficiently generate: single-photon states for two-level systems and squeezed states (with a Gaussian Wigner function) for nonlinear sources.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 26, 2023•0 citations

Multimode Squeezing of frequency combs

Germán J. de Valcárcel, Giuseppe Patera, Nicolas Treps +1 more

The novel aspect of this study is grounded on the fact that squeezing spectrum of a finite set of super-modes operators can be below the standard quantum limit, giving a clear image that the system is a highly quantum multi-mode system. In fact, not only the super-mode of minimum threshold is perfectly squeezed at threshold but, further, all the other super-modes have nonclassical character and are significantly squeezed provided that their threshold is sufficiently close to the minimum one. It is concluded that synchronously pumped OPOs reveal to be very interesting devices for studying frequency combs at the quantum level. Their quantum multi-modal behavior could be exploited for generation of nonclassical states of the light used for implement optical time measurement of great sensitivity or quantum information protocols.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2007•7 citations

Quantum noise in Raman lasers: Effects of pump bandwidth and super- and sub-Poissonian pumping

Helmut Ritsch, Monika A. M. Marte

We investigate the influence of pump bandwidth and pump intensity noise on the quantum-noise properties of lasers based on a Raman atomic-gain medium, which recently have been predicted to emit narrow-bandwidth, sub-shot-noise light. We show that, using finite-bandwidth pump light, the predicted limit to the laser bandwidth can still be well below the value given by the Shawlow-Townes formula and much smaller than the input bandwidth. The laser intensity noise is shown to be relatively insensitive to input phase noise as long as the Rabi frequency on the lasing transition is large compared to the bandwidth. On the other hand, even small amounts of pump amplitude noise tend to increase strongly the laser spectral bandwidth, especially in the high-intensity limit. Including dynamic pump-noise reduction through multilevel atomic cycling in our model leads to a Mandel Q parameter value even below Q=-1/2, together with a significant enhancement of the output intensity-noise squeezing.

Physical Review A•Mar 1, 1993•37 citations
We consider the interaction of a two-level atom with a squeezed vacuum, both in free space and in a cavity of moderate Q. In the latter case, only vacuum modes coupled to the cavity are squeezed. In both cases we calculate the following quantities for the fluorescent light fields: the second-order intensity correlation function g(2){\mathit{g}}^{(2)}g(2)(\ensuremath{\tau}), the spectrum of squeezing, the coherent spectrum, and the spectrum obtained in a pump-probe absorption measurement. Nonclassical behavior is discussed and comparison to an ordinary vacuum and thermal fields is made. \textcopyright{} 1996 The American Physical Society.
Ultrashort light pulses play an important role in the generation, manipulation and characterization of nonclassical light. Nonclassical light is often generated from a classical pump beam using a nonlinear optical process. One might expect that the high peak intensity of ultrashort pulses would provide the necessary driver for such processes, and this is indeed the case. Ultrashort pulses have been used to generate squeezed states, and quadrature entangled states via three and four wave mixing, photon number states, polarization and frequency or directional entangled photon pairs states via three wave mixing.
Sources of highly nonclassical light are important building blocks of many proposed implementations of optical quantum technologies [1]. The most common realisations of nonclassical light sources are either based on two-level quantum emitters or on nonlinear sources of photon pairs and squeezed light [2] and are generally limited in the properties of the quantum states of light they can efficiently generate: single-photon states for two-level systems and squeezed states (with a Gaussian Wigner function) for nonlinear sources.
The novel aspect of this study is grounded on the fact that squeezing spectrum of a finite set of super-modes operators can be below the standard quantum limit, giving a clear image that the system is a highly quantum multi-mode system. In fact, not only the super-mode of minimum threshold is perfectly squeezed at threshold but, further, all the other super-modes have nonclassical character and are significantly squeezed provided that their threshold is sufficiently close to the minimum one. It is concluded that synchronously pumped OPOs reveal to be very interesting devices for studying frequency combs at the quantum level. Their quantum multi-modal behavior could be exploited for generation of nonclassical states of the light used for implement optical time measurement of great sensitivity or quantum information protocols.
We investigate the influence of pump bandwidth and pump intensity noise on the quantum-noise properties of lasers based on a Raman atomic-gain medium, which recently have been predicted to emit narrow-bandwidth, sub-shot-noise light. We show that, using finite-bandwidth pump light, the predicted limit to the laser bandwidth can still be well below the value given by the Shawlow-Townes formula and much smaller than the input bandwidth. The laser intensity noise is shown to be relatively insensitive to input phase noise as long as the Rabi frequency on the lasing transition is large compared to the bandwidth. On the other hand, even small amounts of pump amplitude noise tend to increase strongly the laser spectral bandwidth, especially in the high-intensity limit. Including dynamic pump-noise reduction through multilevel atomic cycling in our model leads to a Mandel Q parameter value even below Q=-1/2, together with a significant enhancement of the output intensity-noise squeezing.