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Researchers at the University of Calgary have demonstrated a novel quantum memory integration that extends signal storage for superconducting qubits up to 620 microseconds with minimal noise. By utilizing a three-level atomic system in a Yb:YSO crystal, this work enables on-demand microwave-to-optical transduction, a critical step for linking distant quantum processors in future networks. The protocol's coherence is verified through interference patterns, offering a pathway to expand entanglement capacity without complex spectral filtering.

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Researchers synchronize qubits using a new quantum memory trick

Quantum ZeitgeistSeptember 11, 20266 min read

Researchers boosted superconducting qubits’ coherence using a novel quantum memory trick, storing signals for up to 620 microseconds.

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…

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