Methods and systems for a 2-qubit multi-user quantum key distribution protocol
Summary
USPTO granted Patent US12598062B2 to Huawei Technologies Canada Co., Ltd. covering a method of quantum key distribution using 2-qubit entanglement among three parties (operator O, Alice, and Bob) for multi-user QKD. The patent includes 12 claims related to qubit measurement, encoding, CHSH inequality verification, and quantum key reconciliation.
What changed
USPTO issued Patent US12598062B2 to Huawei Technologies Canada, granting exclusive rights to a 2-qubit multi-user quantum key distribution protocol. The invention enables three-party key sharing where an operator distributes entangled qubits to Alice and Bob, who independently measure and encode sequences before sending encoded lists to the operator for CHSH inequality verification and correlation confirmation.
This patent grant establishes intellectual property protection for Huawei in quantum cryptography technology, potentially restricting competitors from implementing similar MU-QKD protocols without license. Entities developing quantum secure communication systems or quantum networking infrastructure should assess whether their technologies intersect with these claims.
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Apr 8, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Methods and systems for a 2-qubit multi-user quantum key distribution protocol
Grant US12598062B2 Kind: B2 Apr 07, 2026
Assignee
HUAWEI TECHNOLOGIES CANADA CO., LTD.
Inventors
Wen Tong, Sheng Sun
Abstract
A method of quantum key distribution making use of 2-qubit entanglement, by which one entangled qubit is sent from an operator O to Alice and the other entangled qubit is sent from operator O to Bob, making for key-sharing among three parties (multi-user quantum key distribution, i.e. MU QKD). Alice and Bob each measures a respective sequence of qubits randomly along either one of two states, records the measurements in a respective list, and encodes the bits in an encoded list. The encoded lists are sent to operator O for entanglement to be verified with the CHSH inequality. Bob's verified list is sent to Alice and vice-versa, allowing Alice and Bob to further verify correlation. Non-entangled bits are rejected until Alice and Bob have a similar key, being a reconciled quantum-based key as sought.
CPC Classifications
H04L 9/0852 H04L 9/0858 H04L 9/0855 H04L 63/061 H04L 9/083 H04L 9/0822 H04L 9/3226 H04L 9/0891 H04L 9/14 H04L 9/0827 H04L 2209/24 H04L 9/08 H04L 9/0819 H04L 9/088 H04L 9/0869 H04W 12/041 H04W 12/0431 H04W 12/0433 H04W 12/04 H04W 12/61 H04W 12/63 H04W 12/71 G06F 21/31 G06F 21/44 G06F 7/588 G06F 21/72 G06F 21/86
Filing Date
2023-11-28
Application No.
18521368
Claims
12
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