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TT: Fachverband Tiefe Temperaturen

TT 30: Focus Session: Exploring Quantum Entanglement with Superconducting Qubits and Resonators (joint session QI/TT)

TT 30.6: Invited Talk

Tuesday, March 19, 2024, 11:30–12:00, HFT-FT 131

Quantum sensing of axionic dark matter with a phase resolved haloscope — •Audrey Cottet — LPEM, ESPCI Paris — LPENS, Ecole Normale Supérieure de Paris

There is a general consensus that a large part of the matter and energy in the Universe is unknown. Well established candidates for dark matter are axions or axion-like particles. Their interaction with particles of the standard model is expected to be very weak. Hence, their detection requires ultimate amplification and measurement techniques. Quantum sensing is appealing in that context. We propose a new type of detector based on a non-linear quantum cavity coupled to a tunable magnetic mode. In order to circumvent the standard quantum limit of detection, we propose to exploit the phase-number variables of the electromagnetic field. The sensitivity of the detector can be pushed further by exploiting interference fringes in a cavity Schrödinger cat state. We expect a figure of merit exceeding by several orders of magnitude that of current detectors. This opens the way to real-time detection of possible axion signals. I will present how these ideas are being implemented experimentally using a hybrid cavity/magnon/superconducting circuit platform.

Keywords: cavity QED; superconducting circuits; magnonics; dark matter