Discrimination of Coherent States via Atom-Field Interaction without Rotation Wave Approximation

TL;DR

This paper demonstrates that removing the rotating wave approximation in the Jaynes-Cummings model enhances the discrimination of coherent quantum states, reducing failure probability and resource costs by leveraging non-RWA quantum effects.

Contribution

It introduces a non-RWA Jaynes-Cummings approach for quantum state discrimination, showing improved performance over traditional RWA-based methods.

Findings

Non-RWA JC model reduces failure probability in state discrimination.

Non-RWA effects like virtual photons enhance discrimination accuracy.

Unambiguous discrimination with non-RWA is resource-efficient.

Abstract

The quantum state discrimination is an important part of quantum information processing. We investigate the discrimination of coherent states through Jaynes-Cummings (JC) model interaction between the field and the ancilla without rotation wave approximation (RWA). We show that the minimum failure probability can be reduced as RWA is eliminated from JC model and the non-RWA terms accompanied by the quantum effects of fields (e.g. the virtual photon process in the JC model without RWA) can enhance the state discrimination. The JC model without RWA for unambiguous state discrimination is superior to ambiguous state discrimination, particularly when the number of sequential measurements increases. Unambiguous state discrimination implemented via the non-RWA JC model is beneficial to saving resource cost.