SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 22: Quantum Technologies II (joint session Q/MO/QI)
QI 22.7: Talk
Wednesday, March 8, 2023, 16:15–16:30, E214
Non-destructive measurement of phonon number states using the Autler-Townes effect — •Marion Mallweger1, Murilo de Oliveira2, Robin Thomm1, Harry Parke1, Natalia Kuk1, Gerard Higgins1,3, Romain Bachelard2,4, Celso Villas-Boas2, and Markus Hennrich1 — 1Department of Physics, Stockholm University, Sweden — 2Departamento de Física, Universidade Federal de São Carlos, Brazil — 3Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Sweden — 4Université Côte d’Azur, CNRS, Institut de Physique de Nice, France
Quantum technologies employing trapped ion qubits are currently some of the most advanced systems with regards to experimental methods in quantum computation, simulation and metrology. This is primarily due to the excellent control available over the ions’ motional and electronic states. In this work we present a new method to measure the distribution of motional number states in a non-destructive manner. The technique can be applied to all platforms where a quantum harmonic oscillator is coupled to a three level system. We demonstrate the technique using a single trapped 88Sr+ ion. The method relies on the Autler-Townes effect that arises when two levels are strongly coupled while being probed by a third level. If the two levels are coupled on a sideband transition, then the magnitude of the Autler-Townes splitting depends on the phonon number state. This new method provides a robust and efficient way of measuring motional states of quantum harmonic oscillators. It can even be applied to perform single shot measurements of phonon number states in a non-destructive way.