Indirect detection of gravitons through quantum entanglement

Understand

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 seconds 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.