Systems and methods for quantum key generation

A quantum key generation system comprising two photon entanglement chains, two photon detector units, and a plurality of multicore fiber links, wherein

• each photon entanglement chain extends between the two photon detector units;
• the plurality of multicore optical fiber links are structurally configured to optically couple a quantum repeater of each photon entanglement chain to first and second terminating quantum memories of each photon entanglement chain;
• and
• the two photon entanglement chains are structurally configured to generate correlative quantum key bits receivable by each photon detector unit at a bit rate of between about 1-100 MHz.

A quantum key generation system comprising two photon entanglement chains, two photon detector units, and a plurality of multicore fiber links, wherein

• each photon entanglement chain extends between the two photon detector units;
• the plurality of multicore optical fiber links are structurally configured to optically couple a quantum repeater of each photon entanglement chain to first and second terminating quantum memories of each photon entanglement chain;
• and
• the two photon entanglement chains are structurally configured to generate correlative quantum key bits receivable by each photon detector unit at a bit rate Γ that is within about 10% of a processing rate Π of the at least one quantum repeater.

A quantum key generation system comprising two photon entanglement chains, two photon detector units, and a plurality of multicore fiber links, wherein

• each photon entanglement chain extends between the two photon detector units;
• the plurality of multicore optical fiber links are structurally configured to optically couple a quantum repeater of each photon entanglement chain to first and second terminating quantum memories of each photon entanglement chain;
• and
• the two photon entanglement chains are structurally configured to generate correlative quantum information receivable by each photon detector unit at a bit rate Γ that is within about 10% of a processing rate Π of the at least one quantum repeater.