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Walther-Meißner-Institut (WMI), Bayerische Akademie der Wissenschaften
Chair for Technical Physics (E23), Technische Universität München

Seminar on
Superconducting Quantum Circuits
SS 2020


BADW

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Lecture Notes
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Time:
Tuesday, 14:30 - 16:00 h
Place: please check below

Place:
Library Room 142
Walther-Meißner-Institute
Walther-Meißner-Str. 8
Research Campus Garching

Date Speaker Title
21.04.2020
and
28.04.2020
F. Deppe, A. Marx, R. Gross
Walther-Meißner-Institut
Bayerische Akademie der Wissenschaften (BAdW) and Technische Universität München (TUM)
Preliminary discussion and assignment of topics
05.05.2020
Titel, Name
Affiliation
Title of Talk
12.05.2020
Titel, Name
Affiliation
Title of Talk
19.05.2020
Philipp Krüger
TUM
Quantum supremacy using a programmable superconducting processor (Advisor:Michael Renger)
26.05.2020
Jasper Ebel
TUM
Jasper EbelCollective dynamics of strain-coupled nanomechanical pillar resonators (Advisor: Daniel Schwienbacher)
02.06.2020
Karl Miklautz
TUM
Resolving the energy levels of a nanomechanical oscillator (Advisor: Thomas Luschmann)
09.06.2020
Yu Wang
TUM
Generation of multicomponent atomic Schrödinger cat states of up to 20 qubits (Advisor: Qiming Chen)
16.06.2020
Max-Emanuel Kern
TUM
A unidirectional on-chip photonic interface for superconducting circuits (Advisor: Yuki Nojiri)
23.06.2020
Simone Spedicato
TUM
Measurement of Motion beyond the Quantum Limit by Transient Amplification (Advisor: Stefan Pogorzalek)
30.06.2020
Titel, Name
Affiliation
Title of Talk
07.07.2020
Titel, Name
Affiliation
Title of Talk
14.07.2020
Titel, Name
Affiliation
Title of Talk
21.07.2020
Titel, Name
Affiliation
Title of Talk


Seminar description:

Superconducting circuits have evolved from a toy to study fundamental light-matter interaction into a prime candidate for scalable quantum computing. In addition to university groups, industry has started to enter the field (Goolge, IBM, Microsoft, D-Wave Systems, Rigetti quantum computing etc.). As of 2018, chips with several tens of coherent superconducting qubits have been reported, either as open or commercial platforms. The next big challenges are the demonstration of a quantum advantage and useful quantum error correction.

Within the seminar, students give talks on the latest developments in quantum computing with superconducting circuits and related areas such as spin systems or nanomechanics. The seminar is relevant for the special courses on "Superconductivity and Low Temperature Physics" and "Applied Superconductivity". The seminar is suitable for bachelor and master students in the 6. semester and higher. Seminar talks can be given either in English or in German.

 

Zur Durchführung des Seminars:

Wegen der CoViD-19 Situation findet die Lehre im SS2020 zumindest anfangs weitestgehend digital statt. Daher ist den Themen eine Kurzbeschreibung beigefügt. Interessierte Studenten können entweder bis zum 28.4.2020 eine E-Mail an Frank.Deppe@wmi.badw.de mit Wunschthema und Wunschtermin schicken oder sich am 21.4 bzw. am 28.4. per Zoom zur Themenvergabe zuschalten lassen. Diesen Wunsch bitte ebenfalls per E-Mail rechtzeitig mitteilen. Die Vorbesprechungen und Probevorträge erfolgen über Zoom. Die ca. 35-Minütigen Vorträge werden auch über Zoom gehalten, solange nur Online-Lehre erlaubt ist

List of open topics for seminar talks in SS 2020:

  1. Collective dynamics of strain-coupled nanomechanical pillar resonators (J. Doster et al., Nature Communications 10, 5246 (2019):
    In this publication, the authors examine the strain induced coupling of two vertical nanomechanical pillar resonators and show mode hybridization between them. They introduce a new, flexible nanomechanical platform, which may be used in hybrid devices, e.g. by coupling to quantum dots or integrated cavities and should be scalable to a large number of pillars in a straightforward way.
  2. Measurement of Motion beyond the Quantum Limit by Transient Amplification (R. D. Delaney, et al., Phys. Rev. Lett. 123, 183603 (2019)):
    In this work, the authors investigate the motion of a mechanical osciallator in a superconducting quantum circuit. In particular, the authors are able to monitor a single motional quadrature beyond the standard quantum limit by employing a specific read-out technique. The results might lead to novel applications of mechanical devices in superconducting quantum circuits.
  3. Generation of multicomponent atomic Schrödinger cat states of up to 20 qubits (Chao Song et al., Science 365, 574–577 (2019)):
    The GHZ state is predicted to be generated in one step by the free evolution of a Tavis-Cummings system. This experiment demonstrates it in a state-of-the-art superconducting quantum circuit. (See also Science 365, 570–574 (2019) for a similar experiment in the Rydberg platform)
  4. Quantum supremacy using a programmable superconducting processor (F. Arute et al., Nature 574, 505(2019)):
    This publication provides the first demonstration of quantum supremacy by using a superconducting quantum processor consisting of 53 transmon qubits to sample the output of a pseudo-random quantum circuit. The authors demonstrate that this quantum processor can speed up a certain computational task by a factor larger than one billion compared to a classical supercomputer of the current generation. As a conclusion, the authors claim that their machine violates the extended Church-Turing thesis.
  5. A unidirectional on-chip photonic interface for superconducting circuits(P.-O. Guimond et al., npj Quantum Information 6, 32 (2020)):
    Quantum information transfer between distinct components is a requirement for a successful quantum processing. In this paper, instead of using classical passive components such as circulators or reflectors, the authors propose a unidirectional passive, in-situ tunable and robust quantum device with two transmon qubits and SQUID. As a result, this proposed device realizes an effective non-reciprocal interaction between two stationary qubits.
  6. Resolving the energy levels of a nanomechanical oscillator (P.Arrangoiz-Arriola et al., Nature 571, 537 (2019)):
    The coherent states that describe the classical motion of a mechanical oscillator do not have a well defined energy, but are quantum superpositions of equally spaced energy eigenstates. In order to distinguish these contributions an energy sensitivity below the single phonon level is required. In this paper, the authors couple a superconducting quantum bit (qubit) to a nanometer-sized mechanical resonator and are able resolve the latters eigenstates by performing microwave spectroscopy on the qubit.



For general information on the teaching program of TUM see TUMonline.

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