Quantum Cryptography

Lecture spring 2021

Instructor Dominique Unruh
TA Raul-Martin Rebane (submit homework solutions here)
Lecture Period February 10 - May 26
Lectures Wednesdays, 16:15-17:45, Zoom (link in Slack chat) (Dominique; may sometimes be switched with tutorial)
Practice sessions
Tuesdays, 16:15-17:45, Zoom (link in Slack chat) (Raul-Martin)
Course Material Lecture notes (old ones), blackboard photos, practice blackboard photos, and exam study guide.
Language English
Exam TBA
Contact Dominique Unruh <<surname> at ut dot ee>

Topics covered

See also the blackboard photos and the practice blackboard photos.
Feb 10Quantum systems, quantum states, unitary operations.QState, UniTrafo, UnitaryXVideo, Whiteboard
Feb 16Small exercises with single qubits. Polarization invariant under rotation.QState, UniTrafo, Hada, RotaWhiteboard
Feb 17Measurements in computational basis. Elitzur-Vaidman bomb tester. Complete measurements.CBMeas, Bomb, ComplMeas, CompBasisVideo, Whiteboard
Feb 23Light filters as measurements. Improved bomb tester. Quantum Zero effect.Bomb, ComplMeasWhiteboard


Your current amount of points in the homework can be accessed here (as soon as the first sheet has been corrected).
Out Due Homework Solution
2021-02-212020-03-01Homework 1 


In quantum cryptography we use quantum mechanical effects to construct secure protocols. The paradoxical nature of quantum mechanics allows for constructions that solve problems known to be impossible without quantum mechanics. This lecture gives an introduction into this fascinating area.

Possible topics include:


You need no prior knowledge of quantum mechanics. You should have heard some introductory lecture on cryptography. You should enjoy math and have a sound understanding of linear algebra.


[NC00] Nielsen, Chuang. "Quantum Computation and Quantum Information" Cambridge University Press, 2000. A standard textbook on quantum information and quantum computing. Also contains some quantum cryptography.

Further reading may be suggested during the course. See the "further reading" paragraphs in the lecture notes.