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Project Overview

Project Code: NAT 17

Project name:

Next Generation Error Correction with Fluxonium Circuits

TUM Department:

NAT - Physics

TUM Chair / Institute:

E23 - Prof. Stefan Filipp

Research area:

Quantum Computing

Student background:

Physics

Further disciplines:

Participation also possible online only:

Planned project location:

Walther-Meißner-Institute

Project Supervisor - Contact Details


Title:

Given name:

Christian

Family name:

Schneider

E-mail:

christian.schneider@wmi.badw.de

Phone:

+49 (0)89 289 14202

Additional Project Supervisor - Contact Details


Title:

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Family name:

E-mail:

Phone:

Additional Project Supervisor - Contact Details


Title:

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E-mail:

Phone:

Project Description


Project description:

Background:
QLDPC codes are a recently proposed family of quantum error correction codes designed to encode quantum memories more efficiently (number of qubits or logical error rate) and to support modular hardware architectures. Unlike surface codes, they require long-range,bhigh-fidelity two-qubit gates between non-nearest neighbours. While transmons have been the primary platform for their initial exploration, implementing such long-range interactions with high fidelity remains challenging due to their weak anharmonicity and significant crosstalk. Fluxonium qubits, on the other hand, have a strong anharmonicity and lower frequencies, making them a promising but unexplored candidate for realizing low crosstalk, high-fidelity, long-range gates necessary for qLDPC code implementations. This project investigates the viability of fluxonium-based qLDPC code architectures, focusing on the design of inter-chip couplers and gate performance under realistic parameters.


Tasks:
The project comprises two parts:
1. Design of C-Type Couplers for Interposer Integration
QLDPC codes require long-range connections between qubits. The student will design a capacitive C-type coupler on a silicon interposer, suitable for mediating interactions between distant fluxonium qubits. Electromagnetic simulations using HFSS will be performed to optimize coupling strength and suppression of spurious modes.
2. Simulation of Gate Performance
Existing numerical tools used for evaluating gate performance on lattice structures will be adapted to the long-range gate scheme and increased connectivity.


Outcome:
The project will result in a prototype coupler layout suitable for future fabrication and a gate performance analysis for long range couplers for fluxonium qubits. The outcomes may inform ongoing hardware design efforts and contribute to collaborative experimental campaigns.

Working hours per week planned:

40

Prerequisites


Required study level minimum (at time of TUM PREP project start):

3 years of bachelor studies completed

Subject related:

+ Background in quantum physics or quantum information
+ Experience with Python and numerical simulation
+ Familiarity with quantum circuit packages (e.g., scqubits, qutip)
+ Beneficial: prior exposure to quantum error correction methods or microwave simulation tools (e.g. HFSS)

Other:

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