Quantum cache
A quantum cache includes a quantum store having an input that receives a quantum state having fundamental quantum properties comprising coherence and is configured to store the quantum state and to preserve a coherence property of stored quantum states to a fidelity level. A fidelity system is coupled to the quantum store and configured to identify if the quantum state that has a coherence property that is not at the fidelity level using monitoring that preserves a coherence property of quantum states to the fidelity level. The fidelity system is further configure to generate classical data about the quantum state if the coherence property is not at the fidelity level, wherein the generated classical data comprises an index associated with the quantum state. Classical data is generated about the quantum state and is transmitted over a classical channel, thereby informing an application that the quantum state having the associated index has the coherence property that is not at the fidelity level.