Complete frequency-bin Bell basis synthesizer
Suparna Seshadri, Hsuan-Hao Lu, Daniel E. Leaird, Andrew M. Weiner and, Joseph M. Lukens

TL;DR
This paper demonstrates a versatile, turnkey method for generating all four frequency-bin Bell states using standard telecommunication equipment, with high fidelity and potential for sensing applications.
Contribution
It introduces a novel setup for complete frequency-bin Bell state synthesis with high fidelity, utilizing spectral pumping and Bayesian state reconstruction.
Findings
Achieved fidelities ≥97% for all Bell states
Demonstrated sensitivity to temporal delays in frequency-bin states
Enabled potential for enhanced resolution and nonlocal sensing
Abstract
We report the experimental generation of all four frequency-bin Bell states in a single versatile setup via successive pumping of spontaneous parametric downconversion with single and dual spectral lines. Our scheme utilizes intensity modulation to control the pump configuration and offers turn-key generation of any desired Bell state using only off-the-shelf telecommunication equipment. We employ Bayesian inference to reconstruct the density matrices of the generated Bell states, finding fidelities 97% for all cases. Additionally, we demonstrate the sensitivity of the frequency-bin Bell states to common-mode and differential-mode temporal delays traversed by the photons comprising the statepresenting the potential for either enhanced resolution or nonlocal sensing enabled by our complete Bell basis synthesizer.
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Taxonomy
TopicsNeural Networks and Reservoir Computing · Photonic and Optical Devices · Mechanical and Optical Resonators
