Abstract
We demonstrate a Bell state analyzer that operates directly on frequency mismatch. Based on electro-optic modulators and Fourier-transform pulse shapers, our quantum frequency processor design implements interleaved Hadamard gates in discrete frequency modes. Experimental tests on entangled-photon inputs reveal fidelities of ∼98% for discriminating between the |Ψ+〉 and |Ψ-〉 frequency-bin Bell states. Our approach resolves the tension between wavelength-multiplexed state transport and high-fidelity Bell state measurements, which typically require spectral indistinguishability.
| Original language | English |
|---|---|
| Pages (from-to) | 280-283 |
| Number of pages | 4 |
| Journal | Optica |
| Volume | 9 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2022 |
| Externally published | Yes |
Funding
Funding. U.S. Department of Energy, Office of Science (ASCR - Early Career Research Program); Air Force Research Laboratory (FA8750-20-P-1705); National Science Foundation (1747426-DMR, 2034019-ECCS). Acknowledgment. Preliminary results were presented at IPC 2020 as paper number PD5 and CLEO 2021 as paper number FTu1N.5. 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.