#### Pierre-François Cohadon

Associate Professor

Optomechanics and Quantum Measurements team

P.-F. Cohadon’s current research activity is split in two distinct areas. On the one hand, optomechanics experiments at LKB on micro- or nanomechanical systems, which aim to demonstrate quantum properties of both light (under the effect of the motion of a movable mirror) and of a mechanical resonator (under the effect of radiation pressure of a laser beam). On the other, he works within the

Virgo Collaboration on the expected radiation-pressure effects in the gravitational interferometer Advanced Virgo, as well as on the sensitivity gain achieved using squeezed light. Despite orders of magnitude between the characteristics of the different systems under study within the optomechanics field (the mass of the moving mirror for instance varies over 14 decades, from hundreds of pg to tens of kg), both activities are surprisingly related.

- A new method of probing mechanical losses of coatings at cryogenic temperatures. S. Galliou, S. Deléglise, M. Goryachev, L. Neuhaus, G. Cagnoli, S. Zerkani, V. Dolique, X. Vacheret, P. Abbé, L. Pinard, C. Michel, T. Karassouloff, T. Briant, P.-F. Cohadon, A. Heidmann, M. E Tobar, R. Bourquin. arXiv (2016)
- High-finesse Fabry-Perot cavities with bidimensional Si3N4 photonic-crystal slabs. X. Chen, C. Chardin, K. Makles, C. Caër, S. Chua, R. Braive, I. Robert-Philip, T. Briant, P.-F. Cohadon, A. Heidmann, T. Jacqmin, S. Deléglise, Nature Light: Science and Applications (2016)

**Publications within the Virgo collaboration**

- GW150914: First results from the search for binary black hole coalescence with Advanced LIGO. The Ligo and Virgo Collaborations. Phys. Rev. D (2016)
- Observing gravitational-wave transient GW150914 with minimal assumptions. The Ligo and Virgo Collaborations. Phys. Rev. D. (2016)
- Tests of General Relativity with GW150914. The Ligo and Virgo Collaborations. Phys. Rev. Lett. (2016)
- GW150914: Implications for the stochastic gravitational-wave background from binary black holes. The Ligo and Virgo Collaborations. Phys. Rev. Lett. (2016)
- GW150914: The Advanced LIGO Detectors in the Era of First Discoveries. The Ligo and Virgo Collaborations. Phys. Rev. Lett. (2016)
- Astrophysical implications of the binary black hole merger GW150914. The Ligo and Virgo Collaborations. The Astrophysical Journal Letters (2016)
- Observation of gravitational waves from a binary black hole merger. The Ligo and Virgo Collaborations. Phys. Rev. Lett. (2016)

- 2D photonic-crystal optomechanical nanoresonator. K Makles, T Antoni, AG Kuhn, S Deléglise, T Briant, P-F Cohadon, R Braive, G Beaudoin, L Pinard, C Michel, V Dolique, R Flaminio, G Cagnoli, I Robert-Philip, A Heidmann. Optics letters (2015).

**Publications within the Virgo Collaboration**

- An all-sky search for long-duration gravitational wave transients with LIGO. The Ligo and Virgo Collaborations. arXiv (2015)
- Searches for continuous gravitational waves from nine young supernova remnants. The Ligo and Virgo Collaborations.The Astrophysical Journal (2015)
- Characterization of the LIGO detectors during their sixth science run. The Ligo and Virgo Collaborations. Classical and Quantum Gravity (2015)
- Directed search for gravitational waves from Scorpius X-1 with initial LIGO data. The Ligo and Virgo Collaborations. Physical Review D (2015)
- Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data. Physical Review D (2015)
- Searching for stochastic gravitational waves using data from the two colocated LIGO Hanford detectors. Physical Review D (2015)

**Proceedings**

- Progress toward cooling a microgram-scale optomechanical resonator to its quantum ground state. L Neuhaus, S Zerkani, A Kuhn, S Chua, T Jacqmin, S Deléglise, T Briant, P-F Cohadon, A Heidmann. European Quantum Electronics Conference (2015)
- Frequency-Dependent Squeezed Light for Surpassing the Standard-Quantum-Limit in a Macroscopic Optomechanical System. S Chua, L Neuhaus, S Zerkani, T Briant, S Deléglise, P-F Cohadon, A Heidmann, European Quantum Electronics Conference (2015)
- Photonic Crystals on High-Q Micromechanical Membrane for Dispersive Cavity Optomechanics. I Krasnokutska, X Chen, K Makles, R Braive, S Deleglise, T Jacqmin, T Briant, P-F Cohadon, I Robert-Philip, A Heidmann, European Quantum Electronics Conference (2015)
- Advanced Virgo Interferometer: a Second Generation Detector for Gravitational Waves Observation. The Ligo and Virgo Collaborations. PROCEEDINGS OF THE SIXTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS (2015)
- The Advanced Virgo detector. The Virgo Collaboration. Journal of Physics: Conference Series 610 (2015)

- Free-space cavity optomechanics in a cryogenic environment. AG Kuhn, J Teissier, L Neuhaus, S Zerkani, E van Brackel, S Deléglise, T Briant, P-F Cohadon, A Heidmann, C Michel, L Pinard, V Dolique, R Flaminio, R Taïbi, C Chartier, O Le Traon. App. Phys. Lett. (2014)

**Publications within the Virgo Collaboration**

- Advanced Virgo: a second-generation interferometric gravitational wave detector. The Virgo Collaboration. Classical and Quantum Gravity (2014)
- Improved upper limits on the stochastic gravitational-wave background from 2009–2010 Ligo and Virgo data. The Ligo and Virgo Collaborations. Phys. Rev. Lett. (2014)
- Multimessenger search for sources of gravitational waves and high-energy neutrinos: Initial results for LIGO-Virgo and IceCube. Physical Review D (2014)
- First all-sky search for continuous gravitational waves from unknown sources in binary systems. Physical Review D (2014)
- Reconstruction of the gravitational wave signal h (t) during the Virgo science runs and independent validation with a photon calibrator. Classical and Quantum Gravity (2014)
- Implementation of an-statistic all-sky search for continuous gravitational waves in Virgo VSR1 data. Phys. rev. lett. (2014).
- Search for gravitational waves associated with γ-ray bursts detected by the interplanetary network. Phys. Rev. Lett. (2014).
- Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO 600, LIGO, and Virgo detectors. Phys. Rev. D (2014).
- Search for gravitational radiation from intermediate mass black hole binaries in data from the second LIGO-Virgo joint science run. Phys. Rev D. (2014).
- Search for gravitational wave ringdowns from perturbed intermediate mass black holes in LIGO-Virgo data from 2005–2010. Physical Review D (2014)
- The NINJA-2 project: detecting and characterizing gravitational waveforms modelled using numerical binary black hole simulations. Classical and Quantum Gravity (2014)
- Constraints on cosmic detectors strings from the LIGO-Virgo gravitational-wave. Phys. Rev. Lett. (2014)
- Application of a Hough search for continuous gravitational waves on data from the fifth LIGO science run. Classical and Quantum Gravity (2014)
- Gravitational waves from known pulsars: results from the initial detector era. The Astrophysical Journal Supplement Series (2014)

**Publications within the Virgo Collaboration**

- Search for long-lived gravitational-wave transients coincident with long gamma-ray bursts. Phys. Rev. D (2013)
- Directed search for continuous gravitational waves from the Galactic center. Phys. Rev. D (2013)
- Prospects for Observing and Localizing Gravitational-Wave Transients with Advanced LIGO and Advanced Virgo. arXiv (2013)

**Conference Proceedings**

- Towards observation of quantum optomechanical correlations. D Garcia Sanchez, A Tavernarakis, A G Kuhn, L Neuhaus, S Zerkani, T. Karassouloff, J. Teissier, S. Deleglise, P.-F. Cohadon, T. Briant, A. Heidmann
CLEO: QELS_Fundamental Science (2013)
- Fabry-perot cavity optomechanics with ultrahigh mechanical-Q-factor quartz micropillars at cryogenic temperature. Neuhaus, AG Kuhn, S Zerkani, J Teissier, D García-Sánchez, S Deléglise, T Briant, P-F Cohadon, A Heidmann. Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC), (2013)
- Cavity optomechanics with photonic crystal nanomembrane. K Makles, T Antoni, AG Kuhn, S Deleglise, T Briant, P-F Cohadon, A Heidmann, R Braive, I Robert-Philip. Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC), (2013)
- Towards observation of quantum optomechanical correlations. S Deleglise, A Tavernarakis, T Karassouloff, P Verlot, S Zerkani, J Teissier, Daniel Garcia-Sanchez, T Briant, P-F Cohadon, A Heidmann. Lasers and Electro-Optics Europe (CLEO EUROPE/IQEC), (2013)

- Propagation of bipartite entangled state through a negative refractive index medium. Q. Glorieux, J. Clark, R. Glasser, U. Vogl, P.D. Lett. Non-Linear Optics. OSA Meeting in Hawaii (2013). ￼
- Four-wave-mixing in hot atomic vapor for spatially multimode squeezed light generation, Q. Glorieux, J. Clark, N. Corzo-Trejo, Z. Zhou, R. Glasser, A. Marino, U. Vogl, P.D. Lett, Post deadline paper in proceedings of ICQI, Ottawa (2011) ￼
- Strong quantum correlations in four wave mixing in 85Rb vapor, Q. Glorieux, S. Guibal, L. Guidoni, J-P. Likforman, T. Coudreau, Proceedings of SPIE Quantum Optics, 7727, (2010) ￼
- Sympathetic cooling in a multi-isotope Sr Coulomb crystal, S. Removille, Q. Glorieux, T. Coudreau, L. Guidoni and J.-P. Likforman, S. Guibal, Proceedings of SPIE Quantum Optics, 7727, (2010) ￼
- A standardized remote monitoring photographic capture system (RMPCS) for in-situ documentation of corrosion protection system tests, J. Crawford, C. Degrigny, Q. Glorieux, P. Bugeja and D. Vella, in Proceedings: Strategies for Saving Our Cultural Heritage, pp. 85-92 (2007) ￼

**Communication in international conferences **

- Invited talk at the 11th international Conference on Laser-light and Interactions with Particles
- Quantum nanocrystal as an efficient single photon source, Invited Oral Presentation at East China Normal University ECNU, Shanghai, China (2015).
- Effect of charging on CdSe/CdS dot-in-rods single-photon emission, Invited Oral Presentation – ICSS – Nano 2014, Hong-Kong, China
- Injection of angular momentum in a polariton superfluid. Poster – ICAP 2014, Washington, USA.
- Polariton-generated intensity squeezing in semiconductor micropillars. Poster – ICSCE 7, 2014, Hakone, Japan.
- Propagation of bipartite entangled state through a negative refractive index medium. Talk – Non-Linear Optics. OSA Meeting, 2013, Hawaii, USA.
- Quantum mutual information of an entangled state through a negative refractive index medium. Poster – ICOLS, 2013, Berkeley, USA.
- Temporally multiplexed storage of images in a Gradient Echo Memory, Poster – ICAP, 2012, Palaiseau, France.
- Atomic diffusion effects on the coherent storage of an image using a gradient echo memory in a warm atomic vapor, Talk – CLEO, 2012, San Jose, CA, USA
- Four-wave-mixing in hot atomic vapor for spatially multimode squeezed light generation, Post deadline talk – International Conference on Quantum Information 2011, Ottawa, Canada.
- Quantum correlations between intense beams using four-wave mixing in atomic vapor: theory and experiments, Talk – European/French Israeli Symposium on Nonlinear and Quantum Optics 2011, Aussois, France.
- Generation of twin beams using four-wave mixing: theory and experiments, Talk – APS Division of Atomic, Molecular and Optical Physics Meeting 2010, Houston, Texas, USA.
- Trapping and cooling of Sr+ ions: strings and large clouds, Poster – APS Division of Atomic, Molecular and Optical Physics Meeting 2010, Houston, Texas, USA.
- Strong quantum correlations in four wave mixing in 85Rb vapor : theory and experiments, Talk , Photonics Europe 2010, Brussels, Belgium.
- Trapped Sr+ ions for quantum information, Talk – IFRAF Conference of Quantum Physics with Atoms and Photons 2009 , Les Houches, France.
- Towards a Quantum memory in trapped ions, Talk , Modern Applications of Trapped Ions 2008, Les Houches, France.
- Cold atoms experiment with Yb, Poster, 2007, School of Physics : Quantum Optics , Les Houches, France.