Quantum measurement with recycled photons

TL;DR

This paper proposes a novel optical device combining an interferometer and a ferri-magnetic sphere resonator to measure the lifetime of macroscopic entangled states by recycling photons, shedding light on the quantum-classical transition.

Contribution

It introduces a new experimental setup that uses photon recycling in an interferometer with a magnetic resonator to study entanglement decay and decoherence.

Findings

Demonstrates photon recycling to measure entanglement lifetime.

Provides a method to study quantum to classical transition.

Suggests potential insights into decoherence processes.

Abstract

We study a device composed of an optical interferometer integrated with a ferri-magnetic sphere resonator (FSR). Magneto-optic coupling can be employed in such a device to manipulate entanglement between optical pulses that are injected into the interferometer and the FSR. The device is designed to allow measuring the lifetime of such macroscopic entangled states in the region where environmental decoherence is negligibly small. This is achieved by recycling the photons interacting with the FSR in order to eliminate the entanglement before a pulse exits the interferometer. The proposed experiment may provide some insight on the quantum to classical transition associated with a measurement process.