Quantum metasurfaces as probes of vacuum particle content

Abstract: The quantum vacuum of the electromagnetic field is inherently entangled across distinct spatial sub-regions, resulting in non-trivial particle content across these sub-regions. However, accessing this particle content in a controlled laboratory experiment has remained far out of experimental reach. Here we propose to overcome this challenge with a quantum mirror made from a two-dimensional sub-wavelength array of atoms that divides a photonic cavity. The array's response to light is tunable between transmissive and reflective states by a control atom that is excited to a Rydberg state. We find that photon content from entangled sub-regions of the vacuum causes frequency shifts that are accessible in near term experimental setups. This feasibility stems from the system's unique ability to create coherent superpositions of transmissive and reflective states, providing the first practical platform for directly observing particle content from entangled spatial sub-regions of the electromagnetic field vacuum.

general relativity and quantum cosmologyquantum physics

Audience: advanced learners

( paper )

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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.

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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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