Physikalisches Kolloquium: Prof. Dr. Mazyar Mirrahimi – LDPC-cat codes for low-overhead quantum computing in 2D

LDPC-cat codes for low-overhead quantum computing in 2D

Abstract: Quantum low-density parity-check (qLDPC) codes promise to drastically reduce the overhead of fault-tolerant quantum computing architectures.
However, all of the known hardware implementations of these codes require advanced technologies: long-range qubit connectivity, high-weight stabilizers, or multi-layered chip layouts.
An alternative approach to reduce the hardware overhead of fault-tolerance relies on bosonic cat qubits where bit-flip errors are exponentially suppressed by design.
In this work, we combine both approaches and propose an architecture based on cat qubits concatenated in classical LDPC codes correcting for phase-flips.
Employing such phase-flip LDPC codes provides two major advantages.
First, the hardware implementation of the code can be realised with short-range qubit interactions in 2D and low-weight stabilizers, which makes it readily compatible with current superconducting circuit technologies.
Second, we demonstrate how to implement a fault-tolerant universal set of logical gates with a second layer of cat qubits while maintaining the local connectivity.

Sprecher / Speaker: Prof. Dr. Mazyar Mirrahimi, Inria Paris, QUANTIC
Kontakt / Contact: Prof. Dr. Christopher Eichler

Norbert Lindlein lädt Sie zu einem geplanten Zoom-Meeting ein.
Norbert Lindlein invites you to a planned Zoom meeting.

Thema: Physikalisches Kolloquium 2024
Zoom-Link:
https://fau.zoom-x.de/j/61610033904?pwd=QTRpUThPZEg5YVBPd3pFYzVHdGYvUT09
Meeting-ID: 616 1003 3904, Kenncode: 285966