On-demand single-photon source for 1.3μm telecom fiber

We demonstrate an on-demand single-photon source that is compatible with standard telecom optical fiber. Through careful control of the critical strains of $\mathrm{In}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ self-assembled quantum dots, we produce a microcavity sample with a low density of large dots emitting into the fiber-optic transmission band at $1.3\mu \mathrm{m}$ . The second-order correlation function of the source reveals a strong suppression in the rate of multiphoton pulses at both $5\mathrm{K}$ and above $30\mathrm{K}$ . The source may be useful for fiber-optic-based single-photon applications, such as quantum metrology, quantum communications, and distributed quantum computing.