Difference between revisions of "Quantum noise modeling and detector configurations"
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| − | Our group has contributed to the development of a new approach to squeezed-light exploitation for quantum-noise reduction based on the so-called EPR-entanglement scheme [[https://www.nature.com/articles/nphys4118 Ma et al (2017)]]. The idea inherits elements of the secure communication protocols, where the GW signal would take the role of the "secret" to be communicated between two parties. From the GW detection perspective, it is simply a method to use the detector itself to provide a frequency-dependent preparation of squeezed states for a broadband quantum-noise reduction. A possible implementation of this technology is currently being prepared for the Virgo detector. | + | Our group has contributed to the development of a new approach to squeezed-light exploitation for quantum-noise reduction based on the so-called EPR-entanglement scheme [[https://www.nature.com/articles/nphys4118 Ma et al (2017)]]. The idea inherits elements of the secure communication protocols, where the GW signal would take the role of the "secret" to be communicated between two parties. From the GW detection perspective, it is simply a method to use the detector itself to provide a frequency-dependent preparation of squeezed states for a broadband quantum-noise reduction without the need of additional optical systems like a filter cavity. A possible implementation of this technology is currently being prepared for the Virgo detector. |
[[https://arxiv.org/abs/1911.03701 Conceptual design and modeling of an atom-interferometer GW detector (2020)]] | [[https://arxiv.org/abs/1911.03701 Conceptual design and modeling of an atom-interferometer GW detector (2020)]] | ||
Revision as of 19:16, 15 April 2020
Quantum noise
Quantum noise, together with thermal noise, are the two fundamental noises limiting detector sensitivity. It originates from a quantum description of the state of light, or more colloquially, from the fact that the photodetection is a photon-counting process described by a counting distribution, e.g., a Poissonian distribution. Quantum noise, if expressed as equivalent GW-strain noise, depends on various parameters of the interferometer (light power inside arm cavities, finesse of arm cavities, optical loss), it greatly depends on the interferometer configuration (signal recycling, speedmeter, broadband vs tuned), and finally can also be mitigated with quantum technologies that prepare the light in favorable states (squeezing). Members of this group have contributed to all of these approaches. A review article summarizing some of the basics can be found here [Barsotti et al (2019)].
Detector configurations
Our group has contributed to the development of a new approach to squeezed-light exploitation for quantum-noise reduction based on the so-called EPR-entanglement scheme [Ma et al (2017)]. The idea inherits elements of the secure communication protocols, where the GW signal would take the role of the "secret" to be communicated between two parties. From the GW detection perspective, it is simply a method to use the detector itself to provide a frequency-dependent preparation of squeezed states for a broadband quantum-noise reduction without the need of additional optical systems like a filter cavity. A possible implementation of this technology is currently being prepared for the Virgo detector.
[Conceptual design and modeling of an atom-interferometer GW detector (2020)]
Decoherence / optical loss
[Effect on higher-order spatial modes on squeezed-vacuum fluctuations (2017)]
