Achievable polarization for Heat-Bath Algorithmic Cooling

TL;DR

This paper analyzes the limits of polarization achievable through Heat-Bath Algorithmic Cooling, providing analytic bounds and insights into the maximum purity of qubits starting from mixed states.

Contribution

It offers the first analytic expression for the maximum polarization achievable in Heat-Bath Algorithmic Cooling starting from a totally mixed state.

Findings

Derived an analytic form for maximum polarization of the purified qubit.

Provided an upper bound on the number of steps needed for a target polarization.

Established a lower bound for polarization starting from higher initial states.

Abstract

Pure quantum states play a central role in applications of quantum information, both as initial states for many algorithms and as resources for quantum error correction. Preparation of highly pure states that satisfy the threshold for quantum error correction remains a challenge, not only for ensemble implementations like NMR or ESR but also for other technologies. Heat-Bath Algorithmic Cooling is a method to increase the purity of set of qubits coupled to a bath. We investigated the achievable polarization by analyzing the state when no more entropy can be extracted. In particular we give an analytic form for the maximum polarization of the purified qubit and corresponding state of the whole system for the case when the initial state of the qubits is totally mixed. It is however possible to reach higher polarization while starting with other states with higher polarization, thus our result provides an achievable lower bound. We also give an upper bound of the number of steps needed to get a certain required polarization.