Noiseless Quantum Measurement and Squeezing of Microwave Fields Utilizing Mechanical Vibrations.
A process which strongly amplifies both quadrature amplitudes of an oscillatory signal necessarily adds noise. Alternatively, if the information in one quadrature is lost in phase-sensitive amplification, it is possible to completely reconstruct the other quadrature. Here we demonstrate such a nearly perfect phase-sensitive measurement using a cavity optomechanical scheme, characterized by an extremely small noise less than 0.2 quanta. The device also strongly squeezes microwave radiation by 8 dB below vacuum. A source of bright squeezed microwaves opens up applications in manipulations of quantum systems, and noiseless amplification can be used even at modest cryogenic temperatures.
Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland.
C F
CF
Ockeloen-Korppi
Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland.
E
E
Damskägg
Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland.
J-M
JM
Pirkkalainen
Department of Physics and Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL) FI-40014 University of Jyväskylä, Finland.
T T
TT
Heikkilä
Department of Physics and Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL) FI-40014 University of Jyväskylä, Finland.
F
F
Massel
Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland.
M A
MA
Sillanpää