Figure 3 | Petahertz digital-encoded secure quantum communication. (IMAGE)
Caption
Figure 3 | Petahertz digital-encoded secure quantum communication. a, Alice encodes digital data onto squeezed synthesized light waveforms (aI-III) using the LFS. These waveforms have predefined amplitude thresholds, indicated by the red line: signals above the threshold represent (1), and signals below represent (0). The encrypted data are carried by ultrafast squeezed light pulses, which Alice sends to Bob. She also shares the squeezing degree between channels, the predefined threshold, and the encryption key. b, Upon receiving the data, Bob first checks the squeezing level to confirm the security of the communication. He then decodes the data by sampling the waveform of the synthesized squeezed light pulses. c, Eva attempts to intercept the data using a beamsplitter. Her intervention alters the squeezing level, alerting Alice and Bob to potential tampering. Since Eva does not know the predefined threshold or the data decoding key, her attempt to decode the information results in faulty decoding, as shown in panels cI-III.
Credit
M. Sennary et al.
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CC BY