Fine tuning of phase qubit parameters for optimization of fast single-pulse readout

TL;DR

This paper investigates how optimizing phase qubit parameters and pulse shapes can significantly improve single-pulse readout fidelity, achieving nearly 97% accuracy with 2 ns pulses.

Contribution

It introduces a numerical analysis of parameter tuning for phase qubits to minimize readout errors during single-pulse measurements.

Findings

Readout error has a minimum at specific parameter values.

Optimizing capacitance and pulse shape improves fidelity.

Fidelity reaches up to 97% with 2 ns pulses.

Abstract

We analyze a two-level quantum system, describing the phase qubit, during a single-pulse readout process by a numerical solution of the time-dependent Schroedinger equation. It has been demonstrated that the readout error has a minimum for certain values of the system`s basic parameters. In particular, the optimization of the qubit capacitance and the readout pulse shape leads to significant reduction of the readout error. It is shown that in an ideal case the fidelity can be increased to almost 97% for 2 ns pulse duration and to 96% for 1 ns pulse duration.