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TUE: Tuesday Contributed Sessions

TUE 12: Quantum Sensing and Decoherence: Contributed Session to Symposium III

TUE 12.4: Talk

Tuesday, September 9, 2025, 15:00–15:15, ZHG105

Quantum Sensing with a Strongly Driven Spin — •Dhruv Deshmukh and Joachim Ankerhold — Institute for complex quantum systems, Ulm University, Germany

Quantum systems, when exposed to suitably-tuned strong time-periodic fields, may exhibit subharmonic dynamics, the most prominent case being that of period doubling. In this presentation, we introduce conditions required for period k-tupling dynamics to manifest in the simplest paradigmatic quantum system, namely, a single driven two-level system [1]. Experimental observations, with a driven NV centre, verifying period doubling and higher multiplicities up to period quintupling are showcased [2]. Building upon these results, we show how the period k-tupling dynamics can be used for quantum metrology with a few specific examples. First, we explain how the period doubling dynamics of a driven NV centre depends upon its temperature based zero-field splitting, making it a promising tool for thermometry. Next, we also show how the special case of period-1 dynamical freezing may be used for vector magnetometry due to its direction dependent sensitivity on magnetic field [1]. We also briefly discuss the possibilities of detecting neighbouring nuclear spins through their effect on the driven NV centre dynamics.

Research Articles (to be published soon): [1] Period k-tupling in Driven Two-Level Systems (Dhruv Deshmukh and Joachim Ankerhold) [2] Observation of period doubling and higher multiplicity in a driven single-spin system (Dhruv Deshmukh, Raúl B. González, Roberto Sailer, Ressa S. Said, Fedor Jelezko and Joachim Ankerhold)

Keywords: Strongly Driven Spin; Floquet Physics; NV centre; Magnetometry; Thermometry