## Group seminar
(Every term) Group members will present and discuss their latest progress and results and give tutorial talks.
Some talks will also be given by
Time and place: ## TopicsQuantum information theory Quantum many-body physics Characterization, verification and validation of quantum computing components Simulations of complex quantum systems Applied math Machine learning in quantum physics
## Schedule 2020January 13 | Discussion of ’ *Quantum Approximate Optimization Algorithm: Performance, Mechanism, and Implementation on Near-Term Devices*’
06 | Due to school holidays we will skip this group meeting.
## Schedule 2019December 16 | Raphael will tell us about his ongoing work.
09 | Biswash will speak about ’ *Entanglement properties of quantum grid states*’.
02 | Alexander will speak about quantum walks.
November 25 | Lennar will tell us something about his ongoing work
18| Discussion of ’ *Predicting Features of Quantum Systems using Classical Shadows*’
**14**| (Thursday, 10:30h) Daniel will present the results of his Master's thesis (joint group seminar with Bruss’ group)
11| Raphael will tell us about the theory of *time management*(not physics related but intended to help to get important work done)
04| 2nd discussion of ’ *Efficiently Maximizing a Homogeneous Polynomial over Unit Sphere without Convex Relaxation*’ with a focus on the Alorithm (12) on page 7 and Section 3.2
October 28| Thomas will tell us about ’ *Adaptive weight estimator for quantum error correction*’
21| Discussion of ’ *Efficiently Maximizing a Homogeneous Polynomial over Unit Sphere without Convex Relaxation*’ with a focus on the Alorithm (12) on page 7 and Section 3.2
14| Discussion of practical requirements for quantum error correction based on ’ *Surface codes: Towards practical large-scale quantum computation*’
07| Discussion of ’'quantum supremacy’’ and the famous paper draft by Google ’ *Quantum supremacy using a programmable superconducting processor*’
August 09 | Arxiv watching before summer break: Everyone chooses two of the papers from the last 4 weeks and gives a **short**summary (main results and a bit of context).
July 12 | Raphael and Lennart will tell us about the quantum information workshop in Benasque.
June 28 + July 05 | Group in Benasque.
21 | Discussion of *randomized benchmarking*with (long version) and*interleaved randomized benchmarking*.
14 | Discussion of *“Linear-time general decoding algorithm for the surface code”*.
7 | Discussion of *“Lattice Surgery with a Twist: Simplifying Clifford Gates of Surface Codes”*.
May 31 | Effective holidy
24 | Discussion: Classical simulations of quantum circuits using the phase space formalism.
17 | Continuation of the discussion from last time, starting with Section 2.2.2.
10 | Raphael will lead a discussion on stabalizer states, mainly based on Chapter 2.2 of *“Entanglement in Graph States and its Applications”*.
03 | Paper discussion: *“Quantum advantage with shallow circuits”*and, possibly a follow-up*“Quantum advantage with noisy shallow circuits in 3D”*
April 26 | Daniel Miller will talk about *“Propagation of generalized Pauli errors in qudit Clifford circuits”*and a follow-up project on*“Beating the PLOB bound with error-corrected qudit repeaters”*.12 | Raphael will lead a discussion on *“Locally accurate MPS approximations for ground states of one-dimensional gapped local Hamiltonians”*.05 | Martin will speak about *“Sample complexity of device-independently certified 'quantum supremacy’”*.
March 29 | Discussion of local purifications 22 | Lennart will provide an overview of his current work on tensor networks: Analyze challenges when simulating large scale quantum networks with tensor networks. Event simulation of quantum operations Distributed and parallelized computation Simulation of decoherence with purified states may provide a scalable approach for few quibit nodes.
14 | (Moved from Friday to Thursday 10:30h) Raphael will tell us about his project.
08 | Discussion of variational quantum algorithms starting with the paper *“A variational eigenvalue solver on a quantum processor”*. Also the latest developments are of interest, see*“Computational speedups using small quantum devices”*.
01 | No group meeting (Carnival)
February 01 | Discussion of *Construction of exact constants of motion and effective models for many-body localized systems*.
05, 10:30h | Our visitor **Jonas Haferkamp**will tell us that Contracting projected entangled pair states is average-case hard.
07 | Discussion of *gate set tomography*, see the original paper and an introduction.
15 | Discussion of an active topic
22 | MK absent
January 11 | Raphael Brieger will speak about:
*How many samples are needed to decide whether or not samples come from a targeted distribution?*.
18 | Lennart Bittel speaks about the preparation of ground states on a quantum computer, see e.g.,*Faster ground state preparation and high-precision ground energy estimation with fewer qubits*and*Quantum algorithm for preparing the ground state of a system via resonance transition*.
25 | Martin Kliesch presents the main theorem and proof of *Local integrals of motion and the logarithmic lightcone in many-body localized systems*.
## Schedule 2018December 07 | Visitor: **Ben Criger**(Delft) will speak about quantum error correction, see*Multi-path Summation for Decoding 2D Topological Codes*.14->19 | Moved to 19th: Ingo Roth (FU Berlin) visiting
November 02 | Canceled due to moved lecture 09 | Raphael Brieger will speak about *From estimation of quantum probabilities to simulation of quantum circuits*.16 | Lennart Bittel will speak about *Restricted Boltzmann machine quantum states*.23 | Reading group mode: we will discuss the methods used in the papers *A quantum-inspired classical algorithm for recommendation systems*and*Quantum-inspired classical algorithms for principal component analysis and supervised clustering*30 | Reading group mode: further discussion of *A quantum-inspired classical algorithm for recommendation systems*and of the underlying method*Fast Monte-Carlo Algorithms for Finding Low-Rank Approximations*
October 12 | Our visitor **Markus Heinrich**will speak about his work*Robustness of Magic and Symmetries of the Stabiliser Polytope*19 | Martin Kliesch will speak (overview talk) 26 | Martin Kliesch absent
March 01 | Discussion of an active topic 08 | Discussion of an active topic
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