Researchers synchronize qubits using a new quantum memory trick

Ujjwal Gautam, Nasser Gohari Kamel, Sourabh Kumar, and Daniel Oblak of the University of Calgary have demonstrated on-demand retrieval of signals in a microwave-to-optical quantum transducer with only 0.4 noise photons in the detection window. This achievement utilizes a quantum memory integrated with transduction in a three-level atomic system, addressing a key challenge in connecting distant superconducting quantum devices. The researchers achieved this signal storage for 460 microseconds using a low-doping concentration crystal maintained at 30 mK, and demonstrated the protocol's coherent nature through observed interference patterns. This work represents the first demonstration of an on-demand microwave-to-optical transducer assisted by memory. Utilizing spin and optical inhomogeneous broadening, researchers at the…