Selected Publications

- Photon Transport in a Bose-Hubbard Chain of Superconducting Artificial Atoms

G. P. Fedorov et al., Phys. Rev. Lett.**126**, 180503 (2021) - Path-Dependent Supercooling of the
He3 Superfluid A-B Transition

Dmytro Lotnyk et al., Phys. Rev. Lett.**126**, 215301 (2021) - Superconductivity in an extreme strange metal

D. H. Nguyen et al., Nat Commun**12**, 4341 (2021) - High-Q Silicon Nitride Drum Resonators Strongly Coupled to Gates

Xin Zhou et al., Nano Lett.**21**, 5738-5744 (2021) - Measurement of the
^{229}Th isomer energy with a magnetic micro-calorimeter

T. Sikorsky et al., Phys. Rev. Lett.**125**(2020) 142503

## Squeezing of Quantum Noise of Motion in a Micromechanical Resonator

*J.-M. Pirkkalainen, E. Damskägg, M. Brandt, F. Massel, M.A. Sillanpää*

A pair of conjugate observables, such as the quadrature amplitudes of harmonic motion, have fundamental fluctuations that are bound by the Heisenberg uncertainty relation. However, in a squeezed quantum state, fluctuations of a quantity can be reduced below the standard quantum limit, at the cost of increased fluctuations of the conjugate variable. Here we prepare a nearly macroscopic moving body, realized as a micromechanical resonator, in a squeezed quantum state. We obtain squeezing of one quadrature amplitude 1.1±0.4 dB below the standard quantum limit, thus achieving a long-standing goal of obtaining motional squeezing in a macroscopic object.

*Phys. Rev. Lett*

**115**, 24 (2015)doi:

*10.1103/PhysRevLett.115.243601*