US 2026/0074800 A1 · SYSTEM AND METHOD FOR DETERMINING ENCRYPTION KEYS USING A PHASE-ENCODING SIGNAL

Abstract

A transmitter to transmit an encoded interferometric signal through a transmission channel is provided, including a signal-generating module to generate an intermediate quantum signal and an intermediate reference signal. The signal-generating module generates a frequency shift between the intermediate quantum signal and the intermediate reference signal. The transmitter also includes an encoding interferometric module configured to determine the encoded interferometric signal including an encoded interferometric quantum signal and an interferometric reference signal tracing a substantially similar optical path. The encoding interferometric module includes an encoding device to apply a phase modulation to only one component of the intermediate quantum signal.

Claims10

Dependent claims

A transmitter configured to transmit an encoded interferometric signal S2 through a transmission channel, said transmitter comprising:

a signal-generating module configured to generate an intermediate quantum signal |Ψ1 and an intermediate reference signal Sc, said signal-generating module further being configured to generate a frequency shift Δω between the intermediate quantum signal |Ψ1 and the intermediate reference signal Sc, and
an encoding interferometric module configured to receive said intermediate quantum signal |Ψ1 and said intermediate reference signal Sc, and to determine an encoded interferometric signal S2 comprising an encoded interferometric quantum signal |ΨA and an interferometric reference signal ScA on the basis of said intermediate quantum signal |Ψ1 and of said intermediate reference signal Sc tracing a substantially similar optical path, the encoding interferometric module comprising an encoding device configured to apply a phase modulation α to only one component of the intermediate quantum signal |Ψ1.

A receiver configured to receive an encoded interferometric quantum signal |ΨA and an interferometric reference signal ScA through a transmission channel, said receiver comprising:

a transcoding interferometric module configured to generate a transcoded interferometric quantum signal |ΨB and a phase-modulated interferometric reference signal ScB on the basis of said encoded interferometric quantum signal |ΨA and of said interferometric reference signal ScA tracing a substantially similar optical path, said transcoding interferometric module comprising a transcoding and phase-modulating device that is configured to apply a phase modulation βeff to only one component of the encoded interferometric quantum signal |ΨA and a phase modulation φm to only one component of the interferometric reference signal ScA, and
a processing module configured to take at least one measurement of the transcoded interferometric quantum signal |ΨB and at least one measurement of the phase-modulated interferometric reference signal ScB, said processing module further being configured to determine the phase modulation βeff on the basis of the phase modulation φm and of said at least one measurement of the phase-modulated interferometric reference signal ScB.

Dependencies are inferred from the claim text.

System and method for determining encryption keys using a phase-encoding signal

Life of this patent

System and method for determining encryption keys using a phase-encoding signal

Life of this patent

Abstract

Claims10