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Microwave and Optical Technology Letters

A setup for quantum cryptography using an all-optical chaotically produced key

Rubens Viana Ramos, Rui Fragassi Souza

Published Jan 20, 2000• 1 citation
Publisher

Abstract

We use the dynamical behavior of a nonlinear fiber ring resonator and the switching capability of a nonlinear fiber coupler to produce a sequence of pulses, with polarization states changing pseudorandomly between two values, to be used as a key in quantum cryptography. The experimental setup is proposed, and simulations are performed. ©2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 79–81, 2000.

DOI
10.1002/(sici)1098-2760(20000120)24:2<79::aid-mop1>3.0.co;2-9

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We use the dynamical behavior of a nonlinear fiber ring resonator and the switching capability of a nonlinear fiber coupler to produce a sequence of pulses, with polarization states changing pseudorandomly between two values, to be used as a key in quantum cryptography. The experimental setup is proposed, and simulations are performed. ©2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 79–81, 2000.
Abstract Random‐bit generators, working as noise generators and producing keys for cryptography's algorithms are very useful in tests of communication links. However, a truly random sequence can be obtained only if a certain physical variable that obeys a certain statistical rule is used. In this paper we show two possible optical setups for a random‐bit generator. They are based on nonlinear quantum dynamics. Their main properties are shown analytically by using numerical simulations. We then use randomness tests to infer the quality of the bit sequences generated by the nonlinear system. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 338–342, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11208
Abstract We propose a new system of quantum cryptography for internet security using Gaussian pulses propagating within a nonlinear ring resonator system, quantum processor and a wavelength router.To increase the channel capacity and security, the multiplexer is operated incorporating a quantum processing unit via an optical multiplexer. The transmission part can be used to generate the high capacity quantum codes within the series of microring resonators and an add/drop filter. The receiver part can be communicated by using the quantum key (quantum bit, qubit) via a wavelength router and quantum processors. The reference states can be recognized by using the cloning unit, which is operated by the add/drop filter, where the communication between Alice and Bob can be performed. The results obtained have shown that the correlated photons can be generated and formed the entangled photon pair, which is allowed to form the secret key between Alice and Bob. In application, the embedded system within the computer processing unit is available for quantum computer. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1094–1099, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25942
Abstract We propose a new system of quantum cryptography for internet security using Gaussian pulses propagating within a nonlinear ring resonator system, quantum processor, and a wavelength router. To increase the channel capacity and security, the multiplexer is operated incorporating a quantum processing unit via an optical multiplexer. The transmission part can be used to generate the high capacity quantum codes within the series of microring resonators and an add/drop filter. The receiver part can be communicated by using the quantum key (quantum bit, qubit) via a wavelength router and quantum processors. The reference states can be recognized by using the cloning unit, which is operated by the add/drop filter, where the communication between Alice and Bob can be performed. Results obtained have shown that the correlated photons can be generated and formed the entangled photon pair, which is allowed to form the secret key between Alice and Bob. In application, the embedded system within the computer processing unit is available for quantum computer. Furthermore, such a concept is also available for internet application via hybrid communications, for instance, wire/wireless, satellite, which can be used to form the internet security. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2505–2509, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25523
A fiber-optic-based coupled waveguide transmission medium is proposed to distribute secret keys in a single-photon polarization-based quantum cryptography setup. Polarization maintenance properties and coupling phenomena of the transmission medium are exploited to achieve accuracy and security of the transferred key. Elliptic fibers and fiber couplers are used to prepare the transmitted photons at the sender as well as analyze them at the receiver. The uniqueness of the setup stands on the exclusive use of fiber-optic components, enabling its construction on a single fiber line.