Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 13: QIP Implementations: Photons II

MON 13.2: Talk

Monday, September 8, 2025, 16:45–17:00, ZHG001

Switching, Amplifying, and Chirping Diode Lasers with Current Pulses for High Bandwidth Quantum Technologies — •Gianni Buser, Roberto Mottola, Suyash Gaikwad, and Philipp Treutlein — Universität Basel, Departement Physik, Klingelbergstrasse 82, 4056 Basel, Schweiz

High-bandwidth asynchronous (fast and triggered) operation is key to establishing the technological relevance of current proof-of-principle quantum devices. Therein, achieving sufficient speed and contrast in amplitude and phase modulation of light is a widespread performance limitation. For instance, quantum memories storing photons in collective matter excitations by optical control often suffer from unintentional readout due to leaking control light during the storage time [1,2]. Moreover, the control intensities are regularly such, that two-photon process like read/write operations technically require chirped pulses to remain on resonance over the course of their dynamics because of induced atomic level shifts. This talk describes direct current modulation methods that grant independent phase and amplitude control over diode lasers. A system capable of producing watt power level, nanosecond duration optical pulses with 60 dB intensity contrast between their on and off states and simultaneous chirps at rates up to 150 MHz/ns on demand [3] is presented, and application to high bandwidth quantum technology is discussed. [1] PRX Quantum 3, 020349 (2022), [2] PRL 131, 260801 (2023), [3] RSI 95, 123001 (2024).

Keywords: fast laser modulation; optimal control; asynchronous devices; quantum memory; single photons