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

Quantum Electronics and Laser Science Conference

Coherent control of two-photon phenomena with broadband nonclassical light

Avi Pe’er, Barak Dayan, Asher A. Friesem, Yaron R. Silberberg

Published Dec 10, 2005• 0 citations
Publisher

Abstract

We report two control experiments that exploit the coherent correlations within the spectrum of incoherent broadband down-converted light to demonstrate ultrahigh spectral and temporal resolutions at high power and inherent non-classical features at low power.
DOI
10.1109/qels.2005.1548686

Related papers

Coherent Control ofTwo-Photon Phenomena with Broadband NonClassical Light

Asher A. Friesem

i1 Abstract: We report twocontrol experiments that exploit thecoherent correlations within the spectrum ofincoherent broadband down-converted light todemonstrate ultrahigh spectral and temporal resolutions athigh power andinherent non-classical features atlowpower. c2005Optical Society ofAmerica OCIScodes: (270.6570)Squeezed states, (270.4180)Multiphoton processes, (320.5540) Pulse shaping. Eventhough broadband down-converted light that isgenerated byanarrowband pumpcanbeconsidered as incoherent white noise, itpossesses phase andamplitude correlations between thecorresponding signal-idler modes ES(co) = E,(co, -to). Asaresult, thesignal andtheidler fields arecomplex conjugated white noise fields (1). The signal-idler correlations areinherently non-classical since their precision exceeds theclassical limit (sub-shot noise). Inthefollowing wedescribe twocoherent control experiments that exploit this coherent phase relation: One experiment demonstrates control overtwo-photon absorption (TPA) with high-power broadband down-conversion, where thetemporal resolution ofultrashort pulses iscombined with anultrahigh spectral resolution that isotherwise unattainable (1). Another experiment demonstrates control oversum-frequency generation (SFG) intheinherently non-classical low-power regime ofentangled photons. Inthat regime SFGserves asanultrafast coincidence detector andspectral phase manipulations directly affect thetwo-photon wavefunction (2,3). 1.Coherent control oftwo-photon absorption athigh-power. Theexcitation ofanarrow twophoton transition (atfrequency coo) withbroadband light isinsensitive toananti- symmetric spectral phase around tco02 (4). Since thespectral phase ofdown-converted light isanti-symmetric around thepumpfrequency c/pl2, theexcitation isasefficient aswithatransform-limited

•Jan 1, 2005•0 citations

Two Photon Absorption and Coherent Control with Broadband Down-Converted Light

Barak Dayan, Avi Pe’er, Asher A. Friesem +1 more

We experimentally demonstrate two-photon absorption with broadband down-converted light (squeezed vacuum). Although incoherent and exhibiting the statistics of a thermal noise, broadband down-converted light can induce two-photon absorption with the same sharp temporal behavior as femtosecond pulses, while exhibiting the high spectral resolution of the narrow band pump laser. Using pulse-shaping methods, we coherently control two-photon absorption in rubidium, demonstrating spectral and temporal resolutions that are 3-5 orders of magnitude below the actual bandwidth and temporal duration of the light itself. Such properties can be exploited in various applications such as spread-spectrum optical communications, tomography, and nonlinear microscopy.

arXiv:quant-ph/0401088•Physical Review Letters•Jul 9, 2004•252 citations

Coherent control with broadband squeezed vacuum

Barak Dayan, Avi Pe’er, Asher A. Friesem +1 more

We report the experimental demonstration of coherent control with high power, broadband squeezed vacuum. Although incoherent and exhibiting the statistics of a thermal noise, broadband squeezed vacuum is shown to induce certain two-photon interactions as a coherent ultrashort pulse with the same spectral bandwidth. Utilizing pulse-shaping techniques we coherently control the sum-frequency generation of broadband squeezed vacuum over a range of two orders of magnitude. Coherent control of two-photon interactions with broadband squeezed vacuum can potentially obtain spectral resolutions and extinction ratios that are practically unattainable with coherent pulses.

arXiv:quant-ph/0302038•Feb 5, 2003•5 citations

Broadband Spectrally Correlated Light - Properties, Sources and Applications (Ph.D Thesis)

Avi Pe’er

The coherence properties of broadband down converted light are investigated theoretically and experimentally in both the classical and quantum mechanical frameworks. Although broadband down converted light is one-photon incoherent noise, it possesses unique two-photon coherence. Thus, for performing two-photon processes, down-converted light is equivalent to coherent ultrashort pulses in some aspects and to coherent CW laser radiation in others. This equivalence is theoretically established and experimentally demonstrated in the classical, high-power regime. Two applications that take advantage of multi-photon coherence are then described in detail; one for optical spread spectrum communication and the other for sub-diffraction limit optical lithography. A key part of this research is the design and implementation of an efficient source that generates high-power broadband down conversion in a cavity. A broadband oscillation in the cavity is ensured by a mechanism very similar to passive mode-locking of ultrashort pulse laser sources, which we term as pair-wise mode locking, thus extending the equivalence to ultrashort pulses to the light generating sources also. Finally, the quantum mechanical properties of broadband down-conversion are explored experimentally, by performing a two-photon process (sum frequency generation) at the low power level of entangled photon pairs. The non-classical nature of the light is expressed by a linear intensity dependence of the non-linear process. Temporal shaping with femtosecond resolution of the entangled photon pairs is demonstrated using this non-linear interaction.

arXiv:quant-ph/0512133•Dec 16, 2005•0 citations

Simple Route to Strong-Field Coherent Control

Nirit Dudovich, Thomas Polack, Avi Pe’er +1 more

Coherent-control schemes to manipulate weak-field interactions are generally invalid at stronger fields, since strong-field interactions are accompanied by level power broadenings and level shifts that usually elude simple analytical treatments. Here we show that a broad subgroup of weak-field solutions (those with real fields, i.e., fields with only one quadrature in the complex plane) can be extended to the strong-field regime while retaining their properties. The salient feature of these fields is a symmetry that cancels out power broadening effects. Such fields can be generated from ultrashort coherent pulses or from incoherent broadband down-converted light. Weak-field coherent-control approaches based on these solutions can therefore be extended to the strong-field regime as we demonstrate in a two-photon absorption experiment in atomic cesium.

Physical Review Letters•Mar 1, 2005•77 citations

On-Chip Temporal Coherence Synthesis for Classical and Quantum Waveform Processing

Mario Chemnitz, Bennet Fischer, Benjamin MacLellan +8 more

We use a low-loss, user-friendly on-chip interferometer cascade to exploit the concept of temporal coherence synthesis for the shaping of optical pulses and, first-time, of the joint spectral intensity of broadband correlated photon pairs.

Conference on Lasers and Electro-Optics•Jan 1, 2022•0 citations
i1 Abstract: We report twocontrol experiments that exploit thecoherent correlations within the spectrum ofincoherent broadband down-converted light todemonstrate ultrahigh spectral and temporal resolutions athigh power andinherent non-classical features atlowpower. c2005Optical Society ofAmerica OCIScodes: (270.6570)Squeezed states, (270.4180)Multiphoton processes, (320.5540) Pulse shaping. Eventhough broadband down-converted light that isgenerated byanarrowband pumpcanbeconsidered as incoherent white noise, itpossesses phase andamplitude correlations between thecorresponding signal-idler modes ES(co) = E,(co, -to). Asaresult, thesignal andtheidler fields arecomplex conjugated white noise fields (1). The signal-idler correlations areinherently non-classical since their precision exceeds theclassical limit (sub-shot noise). Inthefollowing wedescribe twocoherent control experiments that exploit this coherent phase relation: One experiment demonstrates control overtwo-photon absorption (TPA) with high-power broadband down-conversion, where thetemporal resolution ofultrashort pulses iscombined with anultrahigh spectral resolution that isotherwise unattainable (1). Another experiment demonstrates control oversum-frequency generation (SFG) intheinherently non-classical low-power regime ofentangled photons. Inthat regime SFGserves asanultrafast coincidence detector andspectral phase manipulations directly affect thetwo-photon wavefunction (2,3). 1.Coherent control oftwo-photon absorption athigh-power. Theexcitation ofanarrow twophoton transition (atfrequency coo) withbroadband light isinsensitive toananti- symmetric spectral phase around tco02 (4). Since thespectral phase ofdown-converted light isanti-symmetric around thepumpfrequency c/pl2, theexcitation isasefficient aswithatransform-limited
We experimentally demonstrate two-photon absorption with broadband down-converted light (squeezed vacuum). Although incoherent and exhibiting the statistics of a thermal noise, broadband down-converted light can induce two-photon absorption with the same sharp temporal behavior as femtosecond pulses, while exhibiting the high spectral resolution of the narrow band pump laser. Using pulse-shaping methods, we coherently control two-photon absorption in rubidium, demonstrating spectral and temporal resolutions that are 3-5 orders of magnitude below the actual bandwidth and temporal duration of the light itself. Such properties can be exploited in various applications such as spread-spectrum optical communications, tomography, and nonlinear microscopy.
We report the experimental demonstration of coherent control with high power, broadband squeezed vacuum. Although incoherent and exhibiting the statistics of a thermal noise, broadband squeezed vacuum is shown to induce certain two-photon interactions as a coherent ultrashort pulse with the same spectral bandwidth. Utilizing pulse-shaping techniques we coherently control the sum-frequency generation of broadband squeezed vacuum over a range of two orders of magnitude. Coherent control of two-photon interactions with broadband squeezed vacuum can potentially obtain spectral resolutions and extinction ratios that are practically unattainable with coherent pulses.
The coherence properties of broadband down converted light are investigated theoretically and experimentally in both the classical and quantum mechanical frameworks. Although broadband down converted light is one-photon incoherent noise, it possesses unique two-photon coherence. Thus, for performing two-photon processes, down-converted light is equivalent to coherent ultrashort pulses in some aspects and to coherent CW laser radiation in others. This equivalence is theoretically established and experimentally demonstrated in the classical, high-power regime. Two applications that take advantage of multi-photon coherence are then described in detail; one for optical spread spectrum communication and the other for sub-diffraction limit optical lithography. A key part of this research is the design and implementation of an efficient source that generates high-power broadband down conversion in a cavity. A broadband oscillation in the cavity is ensured by a mechanism very similar to passive mode-locking of ultrashort pulse laser sources, which we term as pair-wise mode locking, thus extending the equivalence to ultrashort pulses to the light generating sources also. Finally, the quantum mechanical properties of broadband down-conversion are explored experimentally, by performing a two-photon process (sum frequency generation) at the low power level of entangled photon pairs. The non-classical nature of the light is expressed by a linear intensity dependence of the non-linear process. Temporal shaping with femtosecond resolution of the entangled photon pairs is demonstrated using this non-linear interaction.
Coherent-control schemes to manipulate weak-field interactions are generally invalid at stronger fields, since strong-field interactions are accompanied by level power broadenings and level shifts that usually elude simple analytical treatments. Here we show that a broad subgroup of weak-field solutions (those with real fields, i.e., fields with only one quadrature in the complex plane) can be extended to the strong-field regime while retaining their properties. The salient feature of these fields is a symmetry that cancels out power broadening effects. Such fields can be generated from ultrashort coherent pulses or from incoherent broadband down-converted light. Weak-field coherent-control approaches based on these solutions can therefore be extended to the strong-field regime as we demonstrate in a two-photon absorption experiment in atomic cesium.