$T_1$-Echo Sequence - Protecting the state of a qubit in the presence of coherent interaction

TL;DR

This paper introduces a pulse sequence similar to spin echo, designed to preserve a qubit's state despite strong coherent interactions, potentially aiding large-scale quantum computing by mitigating residual couplings.

Contribution

It proposes a generalized SWAP-like pulse sequence that protects qubit states from coherent coupling effects, extending spin echo concepts to quantum computing architectures.

Findings

Sequence effectively reduces decoherence caused by coherent interactions

Applicable to large-scale quantum systems with spectral crowding

Potential to improve qubit state preservation in quantum processors

Abstract

We propose a sequence of pulses intended to preserve the state of a qubit in the presence of strong, coherent coupling to another quantum system. The sequence can be understood as a generalized SWAP and works in formal analogy to the well-known spin echo. Since the resulting effective decoherence rate of the qubits state is strongly influenced by the additional system, this sequence might serve to protect its quantum state as well as negating the effects of the coherent coupling. A possible area of application are large scale quantum computing architectures, where spectral crowding of the resources might necessitate a method to mitigate residual couplings.