Cavity-assisted non-destructive detection in strontium optical lattice clocks

Organisation/Company Observatoire de Paris Department LTE Research Field Physics » Quantum mechanics Physics » Metrology Researcher Profile First Stage Researcher (R1) Positions PhD Positions Application Deadline 31 Aug 2026 - 23:59 (Europe/Paris) Country France Type of Contract Temporary Job Status Full-time Hours Per Week 39 Is the job funded through the EU Research Framework Programme? Horizon Europe - MSCA Marie Curie Grant Agreement Number Is the Job related to staff position within a Research Infrastructure? No

Offer Description

The optical frequency group at LTE (Laboratoire Temps Espace, Observatoire de Paris) is developing Optical Lattice Clocks (OLCs) that are now more accurate and more stable than primary frequency standards. These clocks are among the main contenders for a possible redefinition of the SI second. Because OLCs simultaneously probe thousands of neutral atoms, their ultimate frequency stability -- the quantum projection noise -- is by far exceeding the stability of any other frequency reference. To reach and overcome this limit, several noise sources have to be controlled.

The candidate will be in charge of exploiting a non‑destructive detection of the transition probability implemented in a Sr optical lattice clock. This detection is based on a cavity‑enhanced dispersive interaction between light and cold atoms, with a signal‑to‑noise ratio below the standard quantum limit, hence able to produce Spin Squeezed States (SSSs) of the atomic ensemble. She/He will contribute to the implementation of a clock interrogation protocol taking advantage of the SSSs to improve the clock stability. Then, the candidate will work in a new version of the detection system suitable for operational metrological measurements.

Requirements

Research Field Physics » Quantum mechanics Education Level Master Degree or equivalent

Skills/Qualifications

• Obtained a M2 degree in quantum physics
• Knowledge in atomic physics (cold atoms) and quantum optics
• Previous experience (e.g. M1 or M2 internships) in optics, lasers, electronics, and computer programming
• Experience in quantum optics and cold atoms (asset)

The SYRTE strontium clocks group is composed of approx. 5 persons. A good team spirit, as well as a good knowledge of English, are absolutely necessary.

Additional Information

Candidates must not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately before the recruitment date. They must also not already hold a doctoral degree.