A stable wavelength-tunable triggered source of single photons and cascaded photon pairs at the telecom C-band

Abstract

The implementation of fiber-based long-range quantum communication requires tunable sources of single photons at the telecom C-band. Stable and easy-to-implement wavelength- tunability of individual sources is crucial to (i) bring remote sources into resonance, to (ii) define a wavelength standard and to (iii) ensure scalability to operate a quantum repeater. So far, the most promising sources for true, telecom single photons are semiconductor quantum dots, due to their ability to deterministically and reliably emit single and entangled photons. However, the required wavelength-tunability is hard to attain. Here, we show a stable wavelength-tunable quantum light source by integrating strain-released InAs quantum dots on piezoelectric substrates. We present triggered single-photon emission at 1.55 μm with a multiphoton emission probability as low as 0.097, as well as photon pair emission from the radiative biexciton-exciton cascade. We achieve a tuning range of 0.25 nm which will allow to spectrally overlap remote quantum dots or tuning distant quantum dots into resonance with quantum memories. This opens up realistic avenues for the implementation of photonic quantum information processing applications at telecom wavelengths.

5 pages, 3 figures

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Cited by in corpus (8)

• Quantum teleportation using highly coherent emission from telecom C-band quantum dots
• High-throughput quantum photonic devices emitting indistinguishable photons in the telecom C-band
• Coherence and indistinguishability of highly pure single photons from non-resonantly and resonantly excited telecom C-band quantum dots
• GHz-clocked teleportation of time-bin qubits with a telecom C-band quantum dot
• In-situ wavelength tuning of quantum-dot single-photon sources integrated on a CMOS silicon chip
• A tuneable telecom-wavelength entangled light emitting diode
• Impact of MBE-grown (In,Ga)As/GaAs metamorphic buffers on excitonic and optical properties of single quantum dots with single-photon emission tuned to the telecom range
• Reconfigurable frequency coding of triggered single photons in the telecom C--band