Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Computing and Simulation II

Q 68.7: Talk

Friday, March 15, 2024, 16:00–16:15, HS 1199

Programmable high-dimensional mode-sorting of time-frequency states of single photons — •Laura Serino, Abhinandan Bhattacharjee, Michael Stefszky, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany

The time-frequency (TF) degree of freedom of single photons provides high-dimensional encoding alphabets that can enhance quantum information science by increasing the robustness and capacity of quantum information carriers. These alphabets are generally classified into frequency bins, time bins and temporal modes, each coming with its own unique challenges and advantages. Simultaneously manipulating or detecting multiple single-photon TF modes and their superpositions is a challenging task, and most experimental demonstrations rely on complex interferometric setups or on a combination of phase modulators and pulse shapers, which are bound to a specific encoding alphabet.

In this work, we present for the first time programmable high-dimensional mode-sorting of single-photon-level TF states, achieved through a multi-output quantum pulse gate (mQPG). We demonstrate high-fidelity simultaneous high-dimensional projections onto temporal modes, frequency bins and time bins, where the encoding alphabet is changed programmatically via pulse shaping. For each encoding alphabet, we demonstrate projections onto multiple superposition bases, paving the way for practical applications in quantum information science.

Keywords: quantum pulse gate; high dimensional; frequency bins; mode sorter; frequency conversion