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As in conventional computing, key attributes of quantum memories are highstorage density and, crucially, random access, or the ability to read from orwrite to an arbitrarily chosen register. However, achieving such random accesswith quantum memories in a dense, hardware-efficient manner remains achallenge, for example requiring dedicated cavities per qubit or pulsed fieldgradients. Here we introduce a protocol using chirped pulses to encode qubitswithin an ensemble of quantum two-level systems, offering both random accessand naturally supporting dynamical decoupling to enhance the memory lifetime.We demonstrate the protocol in the microwave regime using donor spins insilicon coupled to a superconducting cavity, storing up to four multi-photonmicrowave pulses in distinct memory modes and retrieving them on-demand up to2~ms later. A further advantage is the natural suppression of superradiant echoemission, which we show is critical when approaching unit cooperativity. Thisapproach offers the potential for microwave random access quantum memories withlifetimes exceeding seconds, while the chirped pulse phase encoding could alsobe applied in the optical regime to enhance quantum repeaters and networks.

Random-access quantum memory using chirped pulse phase encoding