November 2024 - ITP-quantumseminare

No QIT seminar next week
by Ladina Hausmann 29 Nov '24

29 Nov '24

Hi all, there is no QIT seminar planned for next week. Best, Ladina

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Monday's QIT seminar in HIT K 52 at 14:00
by Ladina Hausmann 23 Nov '24

23 Nov '24

Hi all, Next week Moritz Scheer will talk about his master's thesis entitled “Renormalization-Based Preparation of Matrix Product States”. The talk will take place on Monday in HIT K 51 at 14:00. See below for the abstract. Best, Ladina ******* Title: Renormalization-Based Preparation of Matrix Product States Abstract: The preparation of useful quantum states on quantum computers is a crucial subroutine in numerous quantum algorithms. Recently, a novel quantum state preparation protocol has been introduced based on the renormalization-group transformation for matrix product states. With local unitary circuits, this method prepares translation-invariant normal MPS for n sites up to error ϵ in depth O(log n/ϵ), which is asymptotically optimal. During my Master thesis, we implemented the renormalization-based preparation algorithm for a family of normal MPS that correspond to ground states of a one-dimensional spin-1/2 Hamiltonian in both the trivial and symmetry-protected topological phases. We executed this algorithm for the first time on a quantum computer using IBM’s latest QPU ibm_fez, and successfully classified the phase of states with up to 80 qubits. Additionally, we compared the renormalization-based preparation protocol with the sequential preparation algorithm, which prepares MPS in depth O(n). In the trivial phase, we observed a cross-over point at approximately 40 qubits. Beyond that, the renormalization-based protocol outperforms the sequential method, demonstrating its superior asymptotic scaling. In this presentation, I will give an introduction to tensor networks and matrix product states, present the sequential and renormalisation-based preparation protocols, and summarise the results obtained during the project.

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Next week's QIT seminar on Wednesday at 14:00 in HIT K52
by Ladina Hausmann 15 Nov '24

15 Nov '24

Hi all, next Monday the former group member Henrik Wilming will give the theory colloquium (https://theorycolloquium.phys.ethz.ch/) so the seminar will be next Wednesday at 14:00 in HIT K52. Then Anqi Gong will talk about “Computation with Quantum Reed-Muller Codes and their Mapping onto 2D Atom Arrays”, see below for the abstract. Best, Ladina **** Title: Computation with Quantum Reed-Muller Codes and their Mapping onto 2D Atom Arrays Abstract: The Steane [[7,1,3]] and the [[15,1,3]] codes are two small instances of punctured quantum Reed-Muller (PQRM) codes admitting transversal (CNOT, H, S) and (CNOT, T) gates, respectively. We generalize them to higher distance PQRM codes, namely [[127,1,15]] and [[127,1,7]]. To enable a universal fault-tolerant computation protocol with them, we are left to solve the following two questions. (1) How to switch between the two codes fault-tolerantly. (2) How to fault-tolerantly prepare the logical states. We show that (1) can be realized through Steane error correction and give a solution for (2) based on automorphism-permuted verification. Our presented solutions are tailored to the neutral atom platform and give superior numerical performance under extended rectangle analysis

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No QIT seminar next week
by Ladina Hausmann 07 Nov '24

07 Nov '24

Hi all, there is no QIT seminar planned for next week. Best, Ladina

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