Ing Ind - Inf (Mag.)(ord. 270) - MI (474) TELECOMMUNICATION ENGINEERING - INGEGNERIA DELLE TELECOMUNICAZIONI
052470 - QUANTUM COMMUNICATIONS
Quantum communication is the transmission of signals by quantum bit (or qubit) instead of bit. The possibility of using photons as a qubit opened concrete possibilities for the unconditioned secure transmission of string of bits (quantum key distribution , QKD) . The course aims to provide the basis for quantum information through an introduction that includes information thermodynamics, information theory and quantum theory. The Course further details the QKD protocols and also focuses on some applications and some technological aspects of the subject.
Risultati di apprendimento attesi
Dublin descriptor 1 (knowledge and understanding). Student will learn how: the information content of a message is measured; the difference between a bit and a qu-bit; Student will learn how: to represent a photon by means of quantum mechanics methods; Student will learn what are the main components of the quantum cryptographic system.
Dublin descriptor 2 (applying knowledge and understanding). Students will be able to: manipulate the Poincaré sphere; to dimension a quantum cryptography link.
Dublin descriptor 3 (making judgements. Student will be able to: understand the fundamental limitations which occur in manipulating qu-bit ; to understand the fundamental trade-off between secure transmission and BER; to recognize the critical parameters in quantum link.
Thermodynamics and Information. Axiomatic thermodynamics. The Entropy and the main parameters. Introduction to the concept of information ( following Nyquist, Hartley, and Szilard). Shannon and the information theory. Introduction to the coding. The main theorems of the information theory.
Quantum elements. Axiomatic quantum mechanics. The algebra of the quantum mechanics. Quantum bit and the main qu-bit operators. The Einstein laws of the matter-radiation interaction. The Fock state and the quantum representation of the light. The physics of the single photon.
Quantum Cryptography Introduction to cryptography. The Bennet-Brassard protocol for the quantum key distribution (QKD). The Block sphere and the Poincaré sphere. QKD experiments and systems. Evolution of the BB-84 protocol.
Quantum technology QKD systems in free-space and in optical fiber. The Single-photon avalanche diode (SPAD). Single photon sources and attenuated sources. The polarization stabilization issues and technology. Retracing paths an birefringence compensation. Mirrors and quantum operators.
Students are required to know “optical communications”. They are also expected to have a basic knowledge of algebra and differential calculus.
Modalità di valutazione
The examination will be only written by means open questions and exercises on the subkject matter delivering during the lectures.
Mario Martinelli, Slide collection of the Course, Anno edizione: 2018 Note:
is the collection of the slides used in delivering the lectures: available on the Web
R. Loudon, The Quantum Theory of the Light, Editore: Oxford Science Publications, Anno edizione: 2000 Note:
is the complementary reference book for the Light and Noise aspects
PAM Dirac, The Principle of Quantum Mechanics, Editore: Oxford, Anno edizione: 2000 Note:
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Tipo Forma Didattica
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Ore di studio autonome
Laboratorio Di Progetto
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Insegnamento erogato in lingua
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