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Spin Qubits

Module PH2307

This module handbook serves to describe contents, learning outcome, methods and examination type as well as linking to current dates for courses and module examination in the respective sections.

Basic Information

PH2307 is a semester module in English or German language at Master’s level which is offered in winter semester.

This Module is included in the following catalogues within the study programs in physics.

  • Specific catalogue of special courses for condensed matter physics
  • Specific catalogue of special courses for Applied and Engineering Physics
  • Focus Area Experimental Quantum Science & Technology in M.Sc. Quantum Science & Technology
  • Complementary catalogue of special courses for nuclear, particle, and astrophysics
  • Complementary catalogue of special courses for Biophysics

If not stated otherwise for export to a non-physics program the student workload is given in the following table.

Total workloadContact hoursCredits (ECTS)
150 h 45 h 5 CP

Responsible coordinator of the module PH2307 is Andreas Reiserer.

Content, Learning Outcome and Preconditions

Content

This lecture will introduce the rich physics of spin qubits, which are among the leading platforms for quantum technologies as they offer three main advantages compared to other physical systems: They are hot, dense and coherent.

In this context, hot means that they can operate at elevated temperatures. While other platforms require mK or even uK temperature, spins in solids can be initialized, controlled, and even entangled up to room temperature.

Dense means that spin qubits can be packed close together without affecting one another. This is important for the integration of a large number of qubits in a single device, such as a quantum computer that will require millions of qubits to achieve universal, fault-tolerant computations.

Finally, the coherence of spin qubits by far outperforms that of any other known system. While most quantum systems can preserve quantum states for less than a millisecond, spin qubits have demonstrated coherence times of more than 6 hours at cryogenic, and 40 minutes at room temperature. This opens the door towards long-term storage of quantum information.

This lecture will give a general introduction to the most prominent experimental platforms for spin qubits: quantum dots, donors, defects and rare-earth dopants. It will further introduce the different techniques to initialize, control, and read the state of spin qubits, as well as techniques to generate entanglement and perform universal quantum gates for quantum computation. Finally, it will explore the different applications in which spin qubits show unique promise: Nanoscale quantum sensors, scalable quantum computers, and quantum communication in global quantum networks.

Learning Outcome

After successful completion of the module the students are able to:

  • Compare different techniques to initialize, control, and read the state of spin qubits
  • Describe the main mechanisms to controllably couple spin qubits and generate entanglement between them
  • Analyze different experimental platforms and in the context of quantum computing, quantum sensing and quantum communication
  • Describe mechanisms that lead to decoherence, and explain how it can be avoided with spin qubits
  • Understand and explain recent scientific publications on spin qubits and related topics

Preconditions

The lecture is targeted to students of the M.Sc. programs in Quantum Science and Technology, Condensed Matter Physics and Applied and Engineering Physics.

Courses, Learning and Teaching Methods and Literature

Courses and Schedule

TypeSWSTitleLecturer(s)DatesLinks
VO 2 Spin Qubits Reiserer, A. Wed, 09:00–10:45, virtuell
eLearning
UE 1 Exercise to Spin Qubits Burger, M.
Responsible/Coordination: Reiserer, A.
dates in groups

Learning and Teaching Methods

The module consists of a lecture (2 SWS) and a tutorial (1 SWS).

In the thematically structured lecture the learning content is presented. With cross references between different topics, the universal concepts of spin qubits are explained. In scientific discussions the students are involved to stimulate their analytical skills.

In the exercise the learning content is deepened and exercised using problem examples involving both analytical and numerical solutions. Thus, the students are able to explain and apply the learned physics knowledge.

Media

Blackboard/Tablet and PowerPoint presentation

Exercise sheets

Literature

S. Haroche & J.M. Raimond: Exploring the Quantum, ISBN 0198509146

More literature recommendations are given in the lecture.

Module Exam

Description of exams and course work

There will be an oral exam of 25 minutes duration. Therein the achievement of the competencies given in section learning outcome is tested exemplarily at least to the given cognition level using comprehension questions and sample calculations.

For example an assignment in the exam might be:

  • Make a sketch of a control sequence that generates a maximally entangled state between two spin qubits.
  • Explain how the individual steps of this control sequence can be implemented with nitrogen-vacancy centers.
  • Describe the main sources of decoherence for spin qubits in silicon, and how this decoherence can be reduced by control and materials engineering.

Participation in the exercise classes is strongly recommended since the exercises prepare for the problems of the exam and rehearse the specific competencies.

Exam Repetition

The exam may be repeated at the end of the semester.

Current exam dates

Currently TUMonline lists the following exam dates. In addition to the general information above please refer to the current information given during the course.

Title
TimeLocationInfoRegistration
Exam to Spin Qubits
Mon, 2021-07-12 Dummy-Termin. Wenden Sie sich zur individuellen Terminvereinbarung an die/den Prüfer(in). Anmeldung für Prüfungstermin vor Mo, 27.09.2021. Melden Sie sich bitte nur an, wenn Sie die Prüfung verbindlich auch nach Lektüre der Informationen unter https://www.tum.de/die-tum/aktuelles/coronavirus/pruefungen/ ablegen werden. // Dummy date. Contact examiner for individual appointment. Registration for exam date before Mon, 2021-09-27. See https://www.tum.de/en/about-tum/news/coronavirus/coronavirus-exams/ for further information and only register after reading! till 2021-06-30 (cancelation of registration till 2021-07-11)
Tue, 2021-09-28 Dummy-Termin. Wenden Sie sich zur individuellen Terminvereinbarung an die/den Prüfer(in). Anmeldung für Prüfungstermin zwischen Di, 28.09.2021 und Sa, 23.10.2021. Melden Sie sich bitte nur an, wenn Sie die Prüfung verbindlich auch nach Lektüre der Informationen unter https://www.tum.de/die-tum/aktuelles/coronavirus/pruefungen/ ablegen werden. // Dummy date. Contact examiner for individual appointment. Registration for exam date between Tue, 2021-09-28 and Sat, 2021-10-23. See https://www.tum.de/en/about-tum/news/coronavirus/coronavirus-exams/ for further information and only register after reading! till 2021-09-27
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