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Probing the quantum motion of a macroscopic mechanical oscillator with a radio-frequency superconducting qubit
Kyrylo Gerashchenko, Rémi Rousseau, Léo Balembois +11
Long-lived mechanical resonators like drums oscillating at MHz frequencies and operating in the quantum regime are a powerful platform for quantum technologies and tests of fundame…
FPGA-based feedback control of quantum optics experiments with the open source software package PyRPL
Leonhard Neuhaus, Michaël Croquette, Rémi Metzdorff +8
We present PyRPL, an open source software package that allows the implementation of automatic digital feedback controllers for quantum optics experiments on commercially available,…
High-sensitivity AC-charge detection with a MHz-frequency fluxonium qubit
B. -L. Najera-Santos, R. Rousseau, K. Gerashchenko +15
Owing to their strong dipole moment and long coherence times, superconducting qubits have demonstrated remarkable success in hybrid quantum circuits. However, most qubit architectu…
Probing a two-level system bath via the frequency shift of an off-resonantly-driven cavity
Thibault Capelle, Emmanuel Flurin, Edouard Ivanov +8
Although the main loss channel of planar microwave superconducting resonators has been identified to be related to an external coupling to a two-level system (TLS) bath, the behavi…
Back-action amplification and quantum limits in optomechanical measurements
P. Verlot, A. Tavernarakis, T. Briant +2
Optical interferometry is by far the most sensitive displacement measurement technique available, with sensitivities at the 10^-20 m/rootHz level in the large-scale gravitational-w…
Observation of back-action cancellation in interferometric and weak force measurements
T. Caniard, P. Verlot, T. Briant +2
We experimentally demonstrate a cancellation of back-action noise in optical measurements. Back-action cancellation was first proposed within the framework of gravitational-wave de…