Bandwidth-tunable Telecom Single Photons Enabled by Low-noise Optomechanical Transduction

• URL: http://arxiv.org/abs/2410.10947v1
• Date: Mon, 14 Oct 2024 18:00:00 GMT
• Title: Bandwidth-tunable Telecom Single Photons Enabled by Low-noise Optomechanical Transduction
• Authors: Liu Chen, Alexander Rolf Korsch, Cauê Moreno Kersul, Rodrigo Benevides, Yong Yu, Thiago P. Mayer Alegre, Simon Gröblacher,
• Abstract summary: Single-photon sources are of fundamental importance to emergent quantum technologies. Nano-structured optomechanical crystals provide an attractive platform for single photon generation. Optical absorption heating has thus far prevented these systems from being widely used in practical applications.
• Score: 45.37752717923078
• License:
• Abstract: Single-photon sources are of fundamental importance to emergent quantum technologies. Nano-structured optomechanical crystals provide an attractive platform for single photon generation due to their unique engineering freedom and compatibility with on-chip silicon fabrication. However, optical absorption heating has thus far prevented these systems from being widely used in practical applications. Here, we overcome this limitation through the use of a quasi-two-dimensional optomechanical crystal structure and demonstrate an on-chip source of single photons natively at telecom wavelength. We verify the low thermal noise and resulting high purity of the generated single photons through a Hanbury Brown-Twiss experiment with $g^{(2)}(0)=0.35^{+0.10}_{-0.08}$. Furthermore, we perform Hong-Ou-Mandel interference of the emitted photons showcasing the indistinguishability and coherence of photons generated from our source with visibility $V=0.52 \pm 0.15$ after 1.43 km of fiber delay line. With the possibility of using the mechanical mode as a quantum memory, we can retrieve the single photons on-demand. Crucial for applications, the optomechanical interaction at the heart of our device allows the bandwidth of emitted single photons to be tuned over a large range from 100 kHz to several hundreds of MHz, which makes them directly compatible with leading quantum memory platforms.

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