Bell state analyzer for spectrally distinct photons

Journal Article · Fri Mar 04 04:00:00 EST 2022 · Optica

DOI:https://doi.org/10.1364/OPTICA.443302· OSTI ID:1847434

Lingaraju, Navin B.; Lu, Hsuan-Hao; Leaird, Daniel E.; Estrella, Steven; Lukens, Joseph M.; Weiner, Andrew M.

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 $\sim \; <\#comment/>98\mathrm{\%\; <\#comment/>}$ for discriminating between the $|{\mathrm{\Psi \; <\#comment/>}}^{+}⟩\; <\#comment/>$ and $|{\mathrm{\Psi \; <\#comment/>}}^{-\; <\#comment/>}⟩\; <\#comment/>$ 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.

• Sponsoring Organization: USDOE
• OSTI ID: 1847434
• Alternate ID(s): OSTI ID: 1854489
• Journal Information: Optica, Journal Name: Optica Journal Issue: 3 Vol. 9; ISSN 2334-2536
• Publisher: Optical Society of America
• Country of Publication: United States
• Language: English