Sabogal Daniel R, Urrego Daniel F, Álvarez Juan R, Herrera Andrés F, Torres Juan P, Valencia Alejandra
Laboratorio de Óptica Cuántica, Universidad de Los Andes, Bogotá, Colombia.
The Barcelona Institute of Science and Technology, ICFO - Institut de Ciencies Fotoniques, Barcelona, Castelldefels, 08860, Spain.
Sci Rep. 2025 Aug 25;15(1):31258. doi: 10.1038/s41598-025-13508-z.
We put forward and demonstrate a controllable decoherence-assisted quantum key distribution scheme. The protocol is based on the possibility of introducing controllable decoherence to polarization qubits using the spatial degree of freedom of light. We show that our method reduces the amount of information that an eavesdropper can obtain in the BB84 protocol under the entangling probe attack. We demonstrate experimentally that Alice and Bob can agree on a scheme that gives low values of the quantum bit error rate, despite the presence of a large amount of decoherence in the transmission channel of the BB84 protocol.
我们提出并演示了一种可控退相干辅助的量子密钥分发方案。该协议基于利用光的空间自由度向偏振量子比特引入可控退相干的可能性。我们表明，在纠缠探测攻击下，我们的方法减少了窃听者在BB84协议中能够获取的信息量。我们通过实验证明，尽管BB84协议的传输通道中存在大量退相干，但爱丽丝和鲍勃仍能就一个给出低量子比特误码率的方案达成一致。
