Quantum communication using code division multiple access network
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Quantum communication using code division multiple access network Vishal Sharma1 · Subhashish Banerjee1 Received: 4 November 2019 / Accepted: 27 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract For combining different single photon channels into a single path, we use an effective and reliable technique which is known as quantum multiple access. We take advantage of an add-drop multiplexer capable of pushing and withdrawing a single photon into an optical fiber cable which carries quantum bits from multiusers. In addition to this, spreading spreads the channel noise at receiver side and use of filters stop the overlapping of adjacent channels, which helps in reducing the noise level and improved signal-to-noise ratio. In this way, we obtain enhanced performance of code division multiple access-based QKD links with a single photon without necessity of amplifiers and modulators. Keywords Direct sequence spread spectrum · Code division multiple access · Secure quantum communication · Optical fiber communication · Quantum networks
1 Introduction Photons are appropriate carrierers for a variety of quantum communication protocols, such as quantum teleportation, quantum key distribution, and other quantum information networks (Nielsen and Chuang 2001). As the encoded quantum states typically do not decohere notably over a transmission path, photons are suitable information carriers for the timely transmission of quantum states. Considerable progress has been made in producing entangled photonic quantum states required for performing different quantum communication protocols (Kok et al. 2007). These provide the base for development of photon-based quantum communication and lead to future quantum-based network technologies. The fully developed quantum communication, out of the laboratory, will entail methods for handling quantum channel access and fidelity. Quantum-based communication systems may be afflicted with both losses and interference effects generated from secondary absorbers and emitters functioning within the same communication environment. These may comprise of unauthorised receivers, such as eavesdroppers and permeable impurities * Vishal Sharma [email protected] Subhashish Banerjee [email protected] 1
IIT Jodhpur, Jodhpur, Rajasthan, India
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in the communication channel, as well as unintentional and intentional emitters, such as transmitters and jammers. Quantum communication with significant reduced information loss using error-correction methods, will enhance capacity of the quantum channel by correcting errors at the receiver end after prudent encoding in a photon-environment (Nielsen and Chuang 2001). Auxiliary methods are likely required for controlling the losses and impinging, present in an asynchronous quantum communication network. Specifically, techniques for allowing concurrent but uncoordinated quantum communication among multiple parties retrieving the identical transmission
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