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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"
To achieve the desired specifications and high performance, the chip is mounted in a low-vibration cryostat with both electrical and optical access. A pulsed laser excites the quantum dot, focusing onto the chip through a confocal microscope objective. Single-photon emission is collected through the same objective, while integrated photonic crystal nanostructures on the chip automatically filter out the laser pump light. This ensures a pure single-photon stream, ready for immediate use.
Sparrow Core demonstrates exceptional robustness to thermal cycling, with minimal wavelength variation even across multiple cycles. This ensures consistent operation over time. For more details, explore a customer’s experience at the University of Vienna – READ MORE.
We can deliver single-photon sources with efficiencies exceeding 50%. For an 80MHz pulsed laser, this translates to at least 40 million photons emitted from the chip per second. Although the final count rate could be reduced by additional setup-dependent losses, the single-photon beam mode can achieve up to 84% overlap with the core of a single-mode fibre, resulting in a rate of up to 33 MHz coupled into the fibre.
When we deliver Sparrow Core, it comes with a detailed characterisation report for a selection of devices on the chip that meet the agreed-upon specifications with the end-user. Depending on the application, some end-users prioritise indistinguishability over purity, or vice versa, and we tailor the characterisation to match those needs. Moreover, as Sparrow Core is a free-space chip, end users can access and explore hundreds of other quantum dots beyond those characterised by our team, offering unique benefits and opportunities for further experimentation.
