Method of privately sharing correlated state information on demand

A method of privately sharing correlated state information on demand, the method comprising:

• a) sharing a pair of entangled qubits between two nodes that are connected by a communication channel, wherein one qubit of the pair of entangled qubits is received by one of the two nodes and the other qubit of the pair of entangled qubits is received by the other of the two nodes;
• b) storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in a quantum cache;
• c) maintaining entanglement and coherence of the stored one qubit of the pair of entangled qubits in the quantum cache for subsequent provisioning of the stored one qubit of the pair of entangled qubits to an application;
• d) detecting a manipulation by a third party of the pair of entangled qubits using a quantum key distribution protocol, thereby ensuring privacy of shared correlated state information from eavesdroppers;
• e) storing classical data in a classical store, the classical data comprising an index that associates particular items of classical data with particular entangled qubits, such that the one qubit of the pair of entangled qubits has a first associated index and the other qubit of the pair of entangled qubits has a second associated index;
• f) providing the stored classical data comprising the index to the application;
• g) unloading the stored one qubit of the pair of entangled qubits to the application at a particular time that is based on the provided stored classical data comprising the index such that the application accesses the stored one qubit of the pair of entangled qubits on demand;
• h) measuring the unloaded stored one qubit of the pair of entangled qubits;
• and
• i) generating the shared correlated state information that is private from eavesdroppers based on the measurement.