Patent ID: 11888978
Assignee: CABLE TELEVISION LABORATORIES, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 21:
22. A node for a measurement-device-independent quantum key distribution network, comprising:
an optical circulator having a first port, a second port, and a third port, the optical circulator being configured to (i) emit, from the second port, light coupled into the first port and (ii) emit, from the third port, light coupled into the first port;
a qubit encoder configured to encode a logical qubit in each of a sequence of optical pulses emitted from the second port of the optical circulator to create a sequence of photonic qubits; and
a calibrator configured to couple a wavelength-calibration signal from a hub of the quantum key distribution network into the third port of the optical circulator such that the wavelength-calibration signal is emitted from the first port of the optical circulator.