Balancing Thermal Relaxation Deviations of Near-Future Quantum Computing Results via Bit-Inverted Programs

TL;DR

This paper presents Barber, a method that uses bit-inverted quantum circuits to counteract thermal relaxation deviations, enhancing the reliability of near-term quantum computing programs.

Contribution

Introducing Barber, a novel approach that employs bit-inverted circuits to balance thermal relaxation deviations in quantum program readouts.

Findings

Effective suppression of thermal relaxation deviations.

Improved accuracy in quantum program readouts.

Compatibility with near-term quantum hardware.

Abstract

One of the predominant causes of program distortion in the real quantum computing system may be attributed to the probability deviation caused by thermal relaxation. We introduce Barber (Balancing reAdout Results using Bit-invErted ciRcuits), a method designed to counteract the asymmetric thermal relaxation deviation and improve the reliability of near-term quantum programs. Barber collaborates with a bit-inverted quantum circuit, where the excited quantum state of qubits is assigned to the $\lvert 0 \rangle$ and the unexcited state to the $\lvert 1 \rangle$. In doing so, bit-inverted quantum circuits can experience thermal relaxation in the opposite direction compared to standard quantum circuits. Barber can effectively suppress the thermal relaxation deviation in program's readout results by selectively merging distributions from the standard and bit-inverted circuits.