Seminar detail: Decoherence induced by gravitons

Date&Time	Tue Nov 09 2021 (17:00 - 18:00)
Speaker	Jiro Soda
Affiliation	Kobe University
Title	Decoherence induced by gravitons
Abstract	I will discuss quantum noise and decoherence induced by gravitons based on our recent papers. We derive a Langevin equation of geodesic deviation in the presence of graviton noise. This indicates the possibility of decoherence induced by gravitons. We propose an experiment that the entanglement between two macroscopic mirrors suspended at the end of an equal-arm interferometer is destroyed by the noise of gravitons through bremsstrahlung. By calculating the correlation function of the noise, we obtain the decoherence time from the decoherence functional. We estimate that the decoherence time induced by the noise of gravitons in squeezed states stemming from inflation is approximately 20 s for 40 km long arms and 40 kg mirrors. Our analysis shows that observation of the decoherence time of quantum entanglement has the potential to detect gravitons indirectly.
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