Experimental noiseless quantum amplification of coherent states of light by two-photon addition and subtraction

Jan B\'ilek; Jarom\'ir Fiur\'a\v{s}ek; Ji\v{r}\'i Fadrn\'y; Martin Bielak; Michal Neset; Miroslav Je\v{z}ek

Experimental noiseless quantum amplification of coherent states of light by two-photon addition and subtraction

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arxiv 2412.13342 v1 pith:SA7ZSYTG submitted 2024-12-17 quant-ph

Michal Neset , Jiří Fadrný , Martin Bielak , Jaromír Fiurášek , Miroslav Ježek , Jan Bílek This is my paper · ORCID

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Noiseless quantum amplifiers are probabilistic quantum devices that enhance amplitude of coherent states without adding any noise, which has far reaching applications in quantum optics and quantum information processing. Here, we report on experimental implementation of an advanced noiseless quantum amplifier for coherent states of light that is based on conditional addition of two photons followed by conditional subtraction of two photons. We comprehensively characterize the noiselessly amplified coherent states via quantum state tomography and analyze the amplification gain and noise properties of the amplifier. We observe very good agreement between the experiment and theoretical predictions. Our work reveals that sequences of multiple photon additions and subtractions represent an efficient and experimentally feasible alternative to multiplexing that was originally proposed to boost the performance of noiseless quantum amplifiers. Beyond noiseless quantum amplification, our experiment represents a significant step forward towards engineering complex quantum operations on traveling light beams by coherent combinations of various sequences of multiphoton additions and subtractions.

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Extended analysis of distillation and purification of squeezed states of light
quant-ph 2025-02 accept novelty 6.0 of 10

Adding a coherent displacement to two-photon subtraction lets one distill arbitrarily strong squeezing from any pure squeezed vacuum, and a Fock filter can purify mixed inputs.

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