Demonstration of a photonic time-frequency Fourier transform and temporal double slit using atomic quantum memory

• URL: http://arxiv.org/abs/2508.09316v2
• Date: Wed, 08 Oct 2025 00:51:48 GMT
• Title: Demonstration of a photonic time-frequency Fourier transform and temporal double slit using atomic quantum memory
• Authors: Ankit Papneja, Jesse Everett, Cameron Trainor, Aaron D. Tranter, Ben C. Buchler,
• Abstract summary: A quantum memory for light is expected to play a crucial role in quantum communication protocols and distributed quantum computing.<n>We demonstrate an in-memory Fourier transform using a combination of two well-established quantum memory protocols.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A quantum memory for light is expected to play a crucial role in quantum communication protocols and distributed quantum computing. In addition to storage and buffering, a quantum memory can be used for manipulations of stored states to allow more complex quantum network operations. In this work, we demonstrate an in-memory Fourier transform using a combination of two well-established quantum memory protocols: Gradient Echo Memory and Electromagnetically Induced Transparency. Our experiment is realised using an ensemble of rubidium atoms that are laser cooled in an elongated magneto-optic trap to maximise optical depth. The results of our time-frequency Fourier transform can be understood as a temporal double slit. We show that the interference between time-separated pulses depends on the relative phase and time between the pulses of light. The use of a quantum memory enables us to illuminate exactly where and how interference occurs between time separated pulses. Time-frequency Fourier manipulation is a well established technique in classical optical systems. Our combination of Fourier manipulation and quantum-compatible memory could be used to bring similar capability to quantum optical systems.

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