Components of a miniaturised quantum memory
Quantum memories are a key component of future quantum networks. They enable the exchange of entanglement and quantum-encrypted communication over long distances by receiving, storing and re-emitting quantum states. The QMEM (QuantumMEMory) project demonstrates progress in the miniaturisation of such a complex quantum system – instead of using conventional vacuum systems and multi-axis laser optics, DLR is developing miniaturised, microtechnology-based glass cells for quantum gases. These glass cells maintain an ultra-high vacuum in which atomic clouds can be isolated using laser light and magnetic fields in a magneto-optical trap (MOT). These glass cells combine a vacuum chamber, vacuum pump, atomic source, temperature sensors and reflection gratings into a single, centimetre-sized system. As a result, the core system of the quantum memory is more than 20 times smaller and 100 times lighter than conventional quantum gas systems.
QMEM represents a partial development in the technology roadmap to develop small and compact quantum systems for real-world application. Since QMEM is intended for use on communication satellites, all components must also be suitable for space conditions. In addition to the compact design, key requirements include energy efficiency and resistance to temperature fluctuations and vibrations. Another crucial aspect is the integration of quantum memory into the complex overall system of a satellite-based quantum network. Such a system involves a wide range of sophisticated technical developments, ranging from the design of a suitable constellation and development of appropriate optical data links for the exchange of quantum information, to connecting with entanglement sources. This complex topic is being tackled by various expert teams at DLR, demonstrating DLR’s exceptional capability in developing high-tech quantum systems for future applications.
German Aerospace Center (DLR)
Institute of Quantum Technologies
E-Mail contact-dlr@DLR.de
Credits: ©DLR