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Transmission of optical phase information using frequency separation of signals as applied to quantum cryptography

P. C. Sun, E. Fineman, Yu. T. Mazurenko

Published Jun 1, 1995• 0 citations
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We propose a method for secure wireless transmission of encrypted information. By use of an encryption key, an image or document is optically encrypted by optical heterodyne scanning and hence encryption is performed on the fly. We call this technique optical scanning cryptography. The output of the heterodyne encrypted signal is at radio frequency and can be directly sent through an antenna to a secure site for digital storage to be prepared for decryption. In the secure site, an identical optical scanning system to that used for encryption is used, together with a decryption key, to generate an electrical signal. The electrical signal is then processed and sent to a computer to be used for decryption. Utilizing the stored information received from the encryption stage and the electrical information from the secure site, a digital decryption unit performs a decryption algorithm. If the encryption key and the decryption key are matched, the decryption unit will decrypt the image or document faithfully. The overall cryptosystem can perform the incoherent optical processing counterpart of the well-known coherent double-random phase-encoding technique. We present computer simulations of the idea.
Fiber optic networks are essential for managing global data traffic, and future telecommunications will require integrating quantum information for applications like quantum key distribution. Encoding quantum information in the frequency domain offers a scalable solution to quantum information transmission. Although the integration of frequency-entangled photons with coherent information transmission is possible through spectral multiplexing, more resource-efficient methods are necessary. We present and experimentally validate a transceiver concept that transmits coherent and frequency-entangled photons within a single frequency channel using the serrodyne technique via electro-optic phase modulation. This approach exploits distinct photon dynamics to enable temporal multiplexing and signal separation. We demonstrate preserved entanglement through the serrodyne transceiver despite coherent light, showing potential for efficient bandwidth use in hybrid quantum-coherent networks.