Kavli Affiliate: Simon Groblacher
| First 5 Authors: Liu Chen, Alexander Rolf Korsch, Cauê Moreno Kersul, Rodrigo Benevides, Yong Yu
| Summary:
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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