Picosecond operations on superconducting quantum register based on Ramsey patterns

TL;DR

This paper introduces a novel ultrafast control method for superconducting qubits using picosecond pulses and Ramsey fringes, enabling high-fidelity quantum operations within extremely short durations.

Contribution

It proposes a new control scheme based on Ramsey interference patterns with picosecond pulses, enhancing speed and fidelity of superconducting qubit operations.

Findings

Achieved control fidelity over 99% with picosecond pulses.

Developed protocols for observing Ramsey oscillations and implementing quantum gates.

Suggested engineering solutions for generating desired ultrafast control pulses.

Abstract

An ultrafast qubit control concept is proposed to reduce the duration of operations with a single and multiple superconducting qubits. It is based on the generation of Ramsey fringes due to unipolar picosecond control pulses. The key role in the concept is played by the interference of waves of qubit states population propagating forward and backward in time. The influence of the shape and duration of control pulses on the contrast of the interference pattern is revealed in the frame of Ramsey's paradigm. Protocols for observation of Ramsey oscillations and implementation of various gate operations are developed. We also suggest a notional engineering solution for creating the required picosecond control pulses with desired shape and amplitude. It is demonstrated that this makes it possible to control the quantum states of the system with the fidelity of more than 99%.