Original key recovery apparatus and method
First Claim
1. An apparatus, comprising:
- a coherent coupler;
a first detector connected to the coherent coupler;
a second detector connected to the coherent coupler;
a first analog-to-digital converter (ADC) connected to the first detector, and a first processor connected to the first ADC, wherein the first ADC and the first processor are configured to implement carrier recovery; and
a second ADC connected to the second detector, and a second processor connected to the second ADC, wherein the second ADC and the second processor are configured to implement key recovery;
wherein the coherent coupler is configured to perform, based on a local oscillator optical signal, optical splitting processing and coherent coupling on a received transmit optical signal, to obtain a plurality of coherently coupled optical signals, wherein the received transmit optical signal comprises a reference optical signal and a quantum optical signal, the plurality of coherently coupled optical signals comprises at least one first coherently coupled optical signal and at least one second coherently coupled optical signal, each first coherently coupled optical signal comprises the reference optical signal, and each second coherently coupled optical signal comprises the quantum optical signal;
wherein the first detector is configured to;
perform optical-to-electrical conversion and amplification on the at least one first coherently coupled optical signal, to obtain a first electrical signal; and
transmit the first electrical signal to the first ADC;
wherein the second detector is configured to;
perform optical-to-electrical conversion and amplification on the at least one second coherently coupled optical signal, to obtain a second electrical signal, wherein an amplification factor corresponding to the at least one first coherently coupled optical signal is smaller than an amplification factor corresponding to the at least one second coherently coupled optical signal; and
transmit the second electrical signal to the second ADC;
wherein the first processor is configured to;
determine, according to the first electrical signal from the first ADC, phase frequency information between the local oscillator optical signal and the reference optical signal; and
send the phase frequency information to the second processor; and
wherein the second processor is configured to recover an original key from the second electrical signal based on the received phase frequency information.
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Abstract
In the embodiments of the present invention, a transmit optical signal includes a reference optical signal and a quantum optical signal, optical splitting processing and coherent coupling are performed on the transmit optical signal by using a local oscillator optical signal to obtain at least two coherently coupled optical signals, and then optical-to-electrical conversion and amplification are separately performed on a first coherently coupled optical signal that includes the reference optical signal and a second coherently coupled optical signal that includes the quantum optical signal, to obtain a first electrical signal and a second electrical signal. Then, phase frequency information between the local oscillator optical signal and the reference optical signal is obtained from the first electrical signal, and an original key is recovered from the second electrical signal based on the phase frequency information.
10 Citations
19 Claims
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1. An apparatus, comprising:
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a coherent coupler; a first detector connected to the coherent coupler; a second detector connected to the coherent coupler; a first analog-to-digital converter (ADC) connected to the first detector, and a first processor connected to the first ADC, wherein the first ADC and the first processor are configured to implement carrier recovery; and a second ADC connected to the second detector, and a second processor connected to the second ADC, wherein the second ADC and the second processor are configured to implement key recovery; wherein the coherent coupler is configured to perform, based on a local oscillator optical signal, optical splitting processing and coherent coupling on a received transmit optical signal, to obtain a plurality of coherently coupled optical signals, wherein the received transmit optical signal comprises a reference optical signal and a quantum optical signal, the plurality of coherently coupled optical signals comprises at least one first coherently coupled optical signal and at least one second coherently coupled optical signal, each first coherently coupled optical signal comprises the reference optical signal, and each second coherently coupled optical signal comprises the quantum optical signal; wherein the first detector is configured to; perform optical-to-electrical conversion and amplification on the at least one first coherently coupled optical signal, to obtain a first electrical signal; and transmit the first electrical signal to the first ADC; wherein the second detector is configured to; perform optical-to-electrical conversion and amplification on the at least one second coherently coupled optical signal, to obtain a second electrical signal, wherein an amplification factor corresponding to the at least one first coherently coupled optical signal is smaller than an amplification factor corresponding to the at least one second coherently coupled optical signal; and transmit the second electrical signal to the second ADC; wherein the first processor is configured to; determine, according to the first electrical signal from the first ADC, phase frequency information between the local oscillator optical signal and the reference optical signal; and send the phase frequency information to the second processor; and wherein the second processor is configured to recover an original key from the second electrical signal based on the received phase frequency information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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performing, based on a local oscillator optical signal, optical splitting processing and coherent coupling on a received transmit optical signal, to obtain at plurality of coherently coupled optical signals, wherein the received transmit optical signal comprises a reference optical signal and a quantum optical signal, the plurality of coherently coupled optical signals comprises at least one first coherently coupled optical signal and at least one second coherently coupled optical signal, each first coherently coupled optical signal comprises the reference optical signal, and each second coherently coupled optical signal comprises the quantum optical signal; performing optical-to-electrical conversion and amplification on the at least one first coherently coupled optical signal to obtain a first electrical signal; performing optical-to-electrical conversion and amplification on the at least one second coherently coupled optical signal to obtain a second electrical signal, wherein an amplification factor corresponding to the at least one first coherently coupled optical signal is smaller than an amplification factor corresponding to the at least one second coherently coupled optical signal; and determining, from the first electrical signal, phase frequency information between the local oscillator optical signal and the reference optical signal, and recovering an original key from the second electrical signal based on the received phase frequency information. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification