Quantum Cryptography | Part 5: Quantum Algorithms & Cryptography

Welcome to 'Quantum Algorithms & Cryptography' course ! This lecture introduces the quantum one-time pad (QOTP), a quantum analogue of the classical one-time pad that provides information-theoretic security for encrypting quantum states. It explains how QOTP uses Pauli matrices to transform an arbitrary mixed state into a maximally mixed state, rendering the ciphertext completely uninformative about the original state. The lecture demonstrates the correctness of QOTP and its security, highlighting the importance of using a random key that is as long as the message and used only once. NPTEL Courses permit certifications that can be used for Course Credits in Indian Universities as per the UGC and AICTE notifications. To understand various certification options for this course, please visit https://nptel.ac.in/courses/106106241 #Quantum-cryptography #Quantumonetimepad #QOTP #Classicalonetimepad #Informationtheoreticsecurity #Maximallymixedstate #Paulimatrices #Unitarymatrices