Opt ical photons are excellent flying qubits for long-distance quantum network s due to negligible thermal noise and decoherence at room temperature. In this talk\, I will discuss how frequency encoding can be combined with non linear optics and fiber and integrated photonic technologies to address ch allenges in scaling future photonic quantum networks. Frequency multiplexi ng has had a profound impact on classical telecommunication networks\, cre ating low loss and inexpensive hardware that can be exploited for quantum applications. I will describe quantum photonic applications where frequenc y encoding provides a distinct advantage in terms of scaling losses and re source overhead compared to polarization\, spatial or temporal mode encodi ng.

\n\nCoherent manipulation of light in the frequency domain at the s ingle-photon level requires a strong\, noise-free nonlinear process. I wil l discuss our implementation of four-wave mixing (FWM) in a commercial dis persion-shifted fiber to achieve quantum frequency conversion with near-un ity efficiency and low noise. I will discuss how we used this process as a n active "\;frequency switch"\; to realize a low-loss multiplexed single-photon source that can be scaled to the deterministic regime. Next\ , I will discuss how we used this process as a frequency beam-splitter to demonstrate two-photon Hong-Ou-Mandel type interference between entangled photons of different colors- a hallmark of quantum indistinguishability. F inally\, I will discuss our realization of a FWM-based "\;time lens&qu ot\; for the generation and detection of single-photon waveforms with pico second r\;esolution.

\n \nBased on Joshi et al.\, Nat. Comm. 9\, 8 47 (2018)\, Joshi et al. Phys. Rev. Lett. 124\, 143601(2020)

\n DTSTART:20211103T180000Z LOCATION:Online\, Room via Zoom SUMMARY:Quantum photonics with color qubits END:VEVENT END:VCALENDAR