Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 32: Quantum Communication II: Implementations (joint session QI/Q)

QI 32.4: Talk

Thursday, March 13, 2025, 15:15–15:30, HS IX

Frequency conversion in a hydrogen-filled hollow core fiber — •Anica Hamer¹, Frank Vewinger², Thorsten Peters³, and Simon Stellmer¹ — ¹Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany — ²Institut für Angewandte Physik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany — ³Institut für Angewandte Physik, Technische Universität Darmstadt, Darmstadt, Germany

Quantum networks, as envisioned for quantum computation and quantum communication applications, are based on a hybrid architecture. Such a layout may include solid-state emitters and network nodes based on photons as so-called flying qubits. This concept requires an efficient and entanglement-preserving exchange of photons between the individual components, which often entails frequency conversion of the photon.

Our approach is based on coherent Stokes Raman scattering (CSRS) in a dense molecular hydrogen gas. This four-wave mixing process sidesteps the limitations of nonlinear crystals, it is intrinsically broadband and does not generate an undesired background. We present broadband and polarization-preserving frequency conversion in a hydrogen-filled anti-resonant hollow-core fiber between 863 nm (InAs/GaAs quantum dots) and the telecom O-band. Disparate from related experiments that employ a pulsed pump field, we here take advantage of two coherent continuous-wave pump fields.

Keywords: Nonlinear Frequency Conversion; Hollow Core Fiber; Stokes Raman Scattering; Four-Wave Mixing Process; Quantum Dots