How to connect different quantum computers through light?
How to convert single photons emitted at near-infrared wavelengths to Telecom-fiber wavelengths?
How to distribute entanglement over long distances by storing and repeating quantum states?
AQLS has the answers. We offer the full range of quantum networking hardware components: entangled photon sources, quantum memories and quantum frequency converters. All operate at room temperature, are standard rack compatible & are compatible with Telecom infrastructure.
Entangled Photon Source
Our entangled photon pair source is the most advanced quantum light source working at room temperature, generating narrow-band photon pairs e.g. at the Rubidium D1 line & a telecom wavelength. Pairs are produced by cavity enhanced Spontaneous Parametric Down Conversion (SPDC) in monolithic, periodically poled Potassium Titanyl Phosphate (ppKTP) resonators.
The unique design of the PPS-DG enables exceptional performance in terms of efficiency and robustness and makes it a pivotal tool for the most demanding quantum research. The narrow band emission is directly compatible with atomic vapour quantum memories. The telecom photon is Telecom-fibre-compatible. The photon rate can be controlled through the pump power.
Key features
- wavelength customisable
- 100 MHz photon bandwidth
- > 100k pairs per second with heralded g2 < 1%
- Tuning range exceeds 10 GHz
- Heralding efficiency up to 75 %
- Room temperature operation
- PM fiber-coupled with freely choosable connector
- Robust, continuous operation
- Flexible external pump laser source
- time-bin and polarization entanglement possible
Quantum Frequency Converter
Optical glass fibres exhibit the highest transmission around 1550nm – the Telecom C-band & zero dispersion around 1310 nm – the Telecom O-band. However, many useful physical systems like defect centres in diamond or single trapped ions emit light in the visible or near-infrared wavelength range. To send these photons over long distances one can use non–linear effects to efficiently convert the photon’s wavelength. Our quantum frequency converter transforms the wavelength of individual photons while preserving its quantum coherence.
Key features
- single-step conversion using ppKTP
- monolithic crystal cavity ensures robustness operation
- 50x pump enhancement of external CW pump
- > 75% internal conversion efficiency
- low noise floor
- room-temperature operation
Quantum Memory
Single Photon quantum states cannot be copied. But when covering long distances single photons get absorbed. To distribute entanglement over long distances one can employ quantum repeaters which establish entanglement over several short links by storing quantum states locally and then distribute the entanglement with a set of pairwise measurements, a process known as entanglement swapping. We build the key ingredient, the quantum memories that store single photons, herald their existence, preserve their quantum state and release them on-demand when the measurement is performed.
Key features
- based on hot atomic vapour (Cesium)
- no cooling infrastructure needed
- compatible with entangled photon source line width
- integrated with lasers and electronics in 19-inch rack
- field-tested and mobile