Coherently Averaged Optmechanical Sensing

Abstract: Coherent averaging schemes have been introduced as a method to achieve the Heisenberg limit in parameter estimation. Typically, these schemes involve multiple probes in a product state interacting with a quantum bus, with parameter estimation performed via measurements on the bus. We propose a novel coherent averaging scheme for force sensing using an array of optomechanical detectors. Our setup consists of $N$ optomechanical cavities, unidirectionally coupled via an input laser pulse in the stroboscopic regime. The goal is to detect some weak unknown force that couples with all the mechanical elements within the cavities. Before being read out, the pulse sequentially passes through all the cavities, accumulating phase shifts, which encode information about the force. Potential applications of this approach include the sensing of gravitational fields at the Large Hadron Collider (LHC), the detection of dark matter signatures, and the measurement of effects predicted by potential collapse models.

general relativity and quantum cosmologyHEP - theoryquantum physics

Audience: advanced learners

( video )

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Tricontinental Quantum Fundamentals Seminar

Series comments: The Tricontinental Quantum Fundamentals Seminar (3C-QFS) is an online seminar series connecting researchers from Australia, Europe, and America. Our goal is to facilitate discussion between the three continents and bring together those working on foundational topics in relativistic quantum physics, covering but not limited to:

• Measurement, localisation, and causality in relativistic quantum theory
• Energy conditions and quantum inequalities
• Non-locality and observer-dependence of entanglement
• Quantum reference frames and symmetries in quantum theory
• Holography, AdS/CFT, and analogue gravity

For 3C-QFS, we wish to foster an inclusive community and promote open discussion by encouraging a casual atmosphere during the seminars.

The seminars are held online via Zoom, consisting of 40-60 minute talks followed by additional time for questions. We meet every three weeks on Tuesday, alternating between two times in order to connect research communities across two of the three continents.

For those unable to join the seminars live, talks are recorded and hosted on the 3C-QFS YouTube channel.

The seminar series is primarily for students and academics active in the foundations of physics. To sign up for the mailing list and join the seminars live, please complete the registration form on the 3C-QFS website.

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