5 Oct 2023Job Information
CNRS and Université de Bordeaux
Science de la Matière et du Rayonnement
Physics » Quantum mechanics
Physics » Optics
First Stage Researcher (R1)
15 Dec 2023 - 12:00 (Europe/Paris)
Type of Contract
Is the job funded through the EU Research Framework Programme?
Not funded by an EU programme
Is the Job related to staff position within a Research Infrastructure?
Project:Optical levitation is a subfield of optomechanics , in which a nanometer-size particle is trapped in a vacuum chamber at the focal spot of a laser focused through a microscope objective 1. The laser beam produces an optical force equivalent to a mechanical spring and the system can be regarded as a simple mass-spring resonator displaying pristine vibrational oscillations in the kHz regime. Because levitated systems outperform other types of mechanical resonators, they are currently exploited to achieve high- sensitivity metrology, detect gravitational waves or search for dark matter. Yet, despite their simplicity, levitated systems provide a remarkable interaction between the mechanical motion of the particle and the light field, which can be harnessed to generate quantum properties.
Ponderomotive squeezing, also known as the mechanically-assisted quantum squeezing of light , provides an interesting illustration of such a property. Here, the intensity fluctuations of the optical field produce small displacements of the particle, which in turn modulate the phase of the photons that are reflected back from the nano-object. Therefore, one induces a correlation between intensity and phase fluctuations onto the reflected optical field that gives rise to quantum-squeezed states of light (i.e., with an uncertainty below that of “classical” states). Achieved here on an extremely simple configuration, such squeezed states are of formidable importance to perform measurements below the standard quantum limit (and especially looked after in environments like the LIGO/VIRGO gravitational waves platforms). Yet, despite early demonstrations 2,3, squeezing performances currently reported with levitated objects are rather limited due to the moderate strength of the light-matter interaction between the nano-object and the optical field.
In this PhD, the candidate will experimentally study how quantum squeezing can be improved through spatio-temporal protocols. Specifically, using spatial light modulators, the incoming light field will be shaped both in time and space to maximize the radiation pressure (i.e., optical force) exerted onto the nano-object 4 and thus bolster light-matter interaction and squeezing. The student will be closely guided by the advisor and will acquire both theoretical and experimental skills on optomechanics, levitation, quantum optics and in spatio-temporal modulation techniques. If required, a Master-2 internship can be proposed to initiate the project.
Physics » Quantum mechanics
Master Degree or equivalent
To deliver on this PhD, the candidate should have received basic knowledge in optics, quantum optics and, if possible, optomechanics and electronics. The student should also possess a solid experimental background. Moreover, some abilities in theory would be appropriate to fully address the topic.
The candidate should speak English fluently. French is not required.
Physics » OpticsPhysics » Quantum mechanics
Years of Research Experience
Additional Information Work Location(s)
Number of offers available
351 Cours de la Libération
GeofieldWhere to apply
https: // scholar.google.fr/citations?user=1djDNg4AAAAJ&hl=fr
cours de la Liberation