Coherence of quantum states after noiseless attenuation
S. U. Shringarpure, Cory M. Nunn, T. B. Pittman, J. D. Franson · Physical Review A · 2022
Attenuating a quantum state using a beam splitter will introduce noise and decoherence. Here we show that heralding techniques can be used to attenuate Schr\"odinger cat states and squeezed vacuum states without any noise or decoherence [Mi\ifmmode \check{c}\else \v{c}\fi{}uda et al., Phys. Rev. Lett. 109, 180503 (2012)]. Noiseless attenuation also preserves quantum interference effects in nonclassical states such as squeezed vacuum states.