Coherence of quantum states after noiseless attenuation

Attenuating a quantum state using a beam splitter will introduce noise and decoherence. Here we show that heralding techniques can be used to attenuate Schrodinger cat states and squeezed vacuum states without any noise or decoherence [Micuda et al., Phys. Rev. Lett. - 109, 180503 (2012)]. Noiseless attenuation also preserves quantum interference effects in nonclassical states such as squeezed vacuum states.

Automated summary

We demonstrate that heralding techniques can achieve noiseless attenuation while preserving quantum interference effects in nonclassical states.