Initialization of NMR Quantum Registers using Long-Lived Singlet States

TL;DR

This paper presents a method to initialize nuclear spin quantum registers using long-lived singlet states, demonstrated experimentally on registers with up to four qubits, enhancing quantum information processing capabilities.

Contribution

It introduces a general initialization technique leveraging long-lived singlet states and experimentally validates it on multi-qubit nuclear spin registers.

Findings

Successful initialization of 2-, 3-, and 4-qubit registers

Demonstrated longer singlet state lifetimes compared to other states

Potential for improved quantum register preparation

Abstract

An ensemble of nuclear spin-pairs under certain conditions is known to exhibit singlet state life-times much longer than other non-equilibrium states. This property of singlet state can be exploited in quantum information processing for efficient initialization of quantum registers. Here we describe a general method of initialization and experimentally demonstrate it with two-, three-, and four-qubit nuclear spin registers.