Quantum Engineering Colloquium


1. Leon Riesebos,  TU Delft, The Netherlands -- 07-06-2017

2. Jeroen van Dijk, TU Delft, The Netherlands -- 07-06-2017


 1.    Pauli Frames for Quantum Computer Architectures

The Pauli frame mechanism allows Pauli gates to be tracked in classical electronics and can relax the timing constraints for error syndrome measurement and error decoding. When building a quantum computer, such a mechanism may be beneficial, and the goal of this paper is not only to study the working principles of a Pauli frame but also to quantify its potential effect on the logical error rate. To this purpose, we implemented and simulated the Pauli frame module which, in principle, can be directly mapped into a hardware implementation. Simulation of a surface code 17 logical qubit has shown that a Pauli frame can reduce the error rate of a logical qubit up to 70% compared to the same logical qubit without Pauli frame when the decoding time equals the error correction time, and maximum parallelism can be obtained.

2.    A Scalable Cryo-CMOS Signal Generator for Single-Qubit Operations

Quantum computers hold the promise to solve computational problems that are intractable by classical computers. However, for their operation, they rely on classical control signals to manipulate the quantum bits (qubits). Solid-state qubits such as transmons and single-electron spin qubits require the application of microwave signals (~ 4-40 GHz) for the manipulation of a single qubit. A CMOS circuit is proposed for the generation of these signals that offers scalability by employing frequency multiplexing of qubits and cryogenic operation. The circuit will be designed in Intel 22 nm technology and targets a qubit fidelity of 99.99%.





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