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DOE OSTI · 1847434

Bell state analyzer for spectrally distinct photons

Lingaraju, Navin B. (ORCID:0000000180361022)·Lu, Hsuan-Hao (ORCID:0000000340090787)·Leaird, Daniel E.·Estrella, Steven (ORCID:0000000201731281)·Lukens, Joseph M. (ORCID:0000000196504462)·Weiner, Andrew M. (ORCID:0000000213348183)
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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 ∼ <#comment/> 98 % <#comment/> for discriminating between the | Ψ <#comment/> + ⟩ <#comment/> and | Ψ <#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.

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Lingaraju, Navin B. (ORCID:0000000180361022), Lu, Hsuan-Hao (ORCID:0000000340090787), Leaird, Daniel E., Estrella, Steven (ORCID:0000000201731281), Lukens, Joseph M. (ORCID:0000000196504462), Weiner, Andrew M. (ORCID:0000000213348183). 2022-03-04. Bell state analyzer for spectrally distinct photons. https://doi.org/10.1364/optica.443302

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