Abstract
We report the experimental generation of all four frequency-bin Bell states in a single versatile setup via successive pumping of spontaneous parametric down-conversion 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 state - presenting the potential for either enhanced resolution or nonlocal sensing enabled by our complete Bell basis synthesizer.
| Original language | English |
|---|---|
| Article number | 230505 |
| Journal | Physical Review Letters |
| Volume | 129 |
| Issue number | 23 |
| DOIs | |
| State | Published - Dec 2 2022 |
Funding
We thank AdvR for loaning the PPLN ridge waveguide. A portion of this work was performed at Oak Ridge National Laboratory, operated by UT-Battelle for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. Funding was provided by the National Science Foundation (1839191-ECCS, 2034019-ECCS) and the U.S. Department of Energy, Office of Science, Advanced Scientific Computing Research, Early Career Research Program (Field Work Proposal ERKJ353).