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For optimal performance, the chip should be mounted in a low-vibration cryostat with both electrical and optical access. The quantum dot is excited by a pulsed laser focused onto the chip through a confocal microscope objective. Single-photon emission is collected via the same objective, while photonic crystal nanostructures integrated into the chip automatically filter out the laser pump light. This ensures the single-photon stream is ready for immediate use. LINK TO DIAGRAM OR APPLICATION NOTE (DO WE HAVE THAT?)
The source demonstrates robustness to thermal cycling over time. Little to no wavelength variations allow operation over multiple thermal cycles. For more insights, read about one customer’s experience in Vienna (LINK).
A deterministic single-photon source provides reliable, on-demand photon emission, ensuring maximum efficiency and scalability for quantum technologies. It enables high-fidelity operations, simplifies system integration, and reduces complexity, empowering cutting-edge quantum technologies to reach their full potential.
We typically aim to deliver single-photon sources with efficiencies exceeding 50%. For an 80 MHz pulsed laser, this translates to at least 40 million photons emitted from the chip. The single-photon beam mode can achieve up to 84% overlap with the core of a single-mode fiber, resulting in over 33 million photons coupled into the fiber. The final count rate will depend on additional setup-dependent losses.
Quantum dots are ideal for single-photon sources due to their precise photon control, near-perfect light coupling in photonic nanostructures, and solid-state stability. They minimize decoherence, ensuring high-quality photons for quantum communication, computing, and networking while being compact, scalable, and reliable. READ MORE HERE: "Quantum-dot-based photonic networks"
Indistinguishability 90–97% (HOM, 12.5 ns), single-photon purity g²(0) < 1%, brightness 20–35% per excitation; typical chip linewidth <3 GHz; lifetime 200–600 ps (measured at the system’s fiber output).
Wavelength is effectively fixed per chip within 920–960 nm (non-tunable in practice). The internal laser runs 80 ± 0.5 MHz; lower rates are supported with an external pulse picker (<80 MHz).
Closed-loop thermal/optical control with automated startup, alignment, and calibration keeps brightness drift <3% over 5 min and <5% over 12 h. The cryostat compressor is mounted in an adjacent rack to suppress vibration (see System Performance).
Keep a stable room temperature (low drift), ensure a low-vibration floor, and provide adequate power and heat handling—these are the biggest levers for long-run stability.
230 VAC ±10% (16 A), 50–60 Hz, room 10–25 °C with <3 °C/h drift, 40–80% RH (non-condensing @ 25 °C), up to 3 kW heat, max altitude 2000 m. Warranty:12 months under Sparrow Quantum’s General Terms.
