Complete frequency-bin Bell basis synthesizer

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 $\ge$ 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 state$\unicode{x2013}$presenting the potential for either enhanced resolution or nonlocal sensing enabled by our complete Bell basis synthesizer.

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Cited by in corpus (6)

• Programmable frequency-bin quantum states in a nano-engineered silicon device
• Recent advances in high-dimensional mode-locked quantum frequency combs
• Characterization of Quantum Frequency Processors
• On-chip frequency-bin quantum photonics
• Quantum nonlocal modulation cancellation with distributed clocks
• Surpassing the loss-noise robustness trade-off in quantum key distribution