title: A squeezed light source operated under high vacuum.
abstract: Non-classical squeezed states of light are becoming increasingly important to a range of metrology and other quantum optics applications in cryptography, quantum computation and biophysics. Applications such as improving the sensitivity of advanced gravitational wave detectors and the development of space-based metrology and quantum networks will require robust deployable vacuum-compatible sources. To date non-linear photonics devices operated under high vacuum have been simple single pass systems, testing harmonic generation and the production of classically correlated photon pairs for space-based applications. Here we demonstrate the production under high-vacuum conditions of non-classical squeezed light with an observed 8.6 dB of quantum noise reduction down to 10 Hz. Demonstration of a resonant non-linear optical device, for the generation of squeezed light under vacuum, paves the way to fully exploit the advantages of in-vacuum operations, adapting this technology for deployment into new extreme environments.
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Wade
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: Georgia L
authors.initials: GL
authors.lastname: Mansell
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.|Now at Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collége de France, Paris, France.
authors.forename: Sheon S Y
authors.initials: SS
authors.lastname: Chua
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Ward
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: Bram J J
authors.initials: BJ
authors.lastname: Slagmolen
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Shaddock
authors.affiliation: Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, 2601, Australia.
authors.forename: David E
authors.initials: DE
authors.lastname: McClelland