Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.40: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Designing a two-output Quantum Pulse Gate — •Theresa Keuter, Patrick Folge, Laura Serino, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS) Warburger Str. 100, 33098 Germany

Time-frequency modes serve as a versatile basis for numerous quantum technology protocols. Yet, the simultaneous detection of distinct time-frequency modes poses a significant challenge. Addressing this issue, a multi-output quantum pulse gate (mQPG) has recently been implemented, which has the capability to map different time-frequency modes to distinct output frequencies, enabling their separation. The mQPG was implemented in dispersion-engineered periodically poled LiNbO₃ waveguides by alternating between poled and unpoled regions, generating multiple phase-matching peaks corresponding to different output frequencies. However, this approach is not optimized for maximal conversion efficiencies due to the presence of unpoled regions in the waveguide. In scenarios where the mQPG operates on quantum states, such as those generated by parametric down conversion, maximizing conversion efficiencies is desireable. Here, we explore an alternative approach by modulating the poling structure with a square wave, which promises higher efficiencies. We focus on the design and optimization of mQPGs with two output channels. We investigate the influence of various parameters on the resulting efficiencies and report on the progress of our ongoing project.

Keywords: Nonlinear Optics; Quantum Networks; Frequency conversion; Integrated Optics; Phase-matching design