Ultrafast cryptography with indefinitely switchable optical nanoantennas

Pujuan Ma; Lei Gao; Pavel Ginzburg; Roman E. Noskov

doi:10.1038/s41377-018-0079-9

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Ultrafast cryptography with indefinitely switchable optical nanoantennas

Original Articles

- Ultrafast cryptography with indefinitely switchable optical nanoantennas
- Ultrafast cryptography with indefinitely switchable optical nanoantennas
- 光：科学与应用 2018年7卷第6期页码：788-796
- Affiliations：
  
  1.School of Physical Science and Technology of Soochow University, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China
  2.Department of Electrical Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv, 69978, Israel
  3.Light-Matter Interaction Centre, Tel Aviv University, Ramat Aviv, Tel Aviv, 69978, Israel
- Author bio：
  
  Lei Gao (leigao@suda.edu.cn)
  Roman E. Noskov (nanometa@gmail.com)
- Funds：
- DOI：10.1038/s41377-018-0079-9
  中图分类号：
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Pujuan Ma, Lei Gao, Pavel Ginzburg, 等. Ultrafast cryptography with indefinitely switchable optical nanoantennas[J]. 光：科学与应用, 2018,7(6):788-796.

Ma, P. J. et al. Ultrafast cryptography with indefinitely switchable optical nanoantennas. Light: Science & Applications, 6, 788-796 (2018).
Pujuan Ma, Lei Gao, Pavel Ginzburg, 等. Ultrafast cryptography with indefinitely switchable optical nanoantennas[J]. 光：科学与应用, 2018,7(6):788-796. DOI： 10.1038/s41377-018-0079-9.

Ma, P. J. et al. Ultrafast cryptography with indefinitely switchable optical nanoantennas. Light: Science & Applications, 6, 788-796 (2018). DOI： 10.1038/s41377-018-0079-9.

摘要

Abstract

Bistability is widely exploited to demonstrate all-optical signal processing and light-based computing. The standard paradigm of switching between two steady states corresponding to "0" and "1" bits is based on the rule that a transition occurs when the signal pulse intensity overcomes the bistability threshold, and otherwise, the system remains in the initial state. Here, we break with this concept by revealing the phenomenon of ,indefinite switching, in which the eventual steady state of a resonant bistable system is transformed into a nontrivial function of signal pulse parameters for moderately intense signal pulses. The essential nonlinearity of the indefinite switching allows realization of well-protected cryptographic algorithms with a single bistable element in contrast to software-assisted cryptographic protocols that require thousands of logic gates. As a proof of concept, we demonstrate stream deciphering of the word "enigma" by means of an indefinitely switchable optical nanoantenna. An extremely high bitrate ranging from ~0.1 to 1 terabits per second and a small size make such systems promising as basic elements for all-optical cryptographic architectures.

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references

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