# Turning off quantum duality

## TL;DR

This paper experimentally confirms a quantum coherence identity in single photons, revealing that quantum duality can be manipulated, which challenges traditional wave-particle duality and supports Bohr's philosophical views.

## Contribution

First experimental verification of a three-way quantum coherence identity in single photons, showing quantum duality can be controlled or turned off.

## Key findings

- Quantum duality can be amplified, attenuated, or turned off.
- Traditional wave-particle duality is limited by this coherence identity.
- Supports Bohr's philosophical assertions about quantum behavior.

## Abstract

We provide the first experimental confirmation of a three-way quantum coherence identity possessed by single pure-state photons. Our experimental results demonstrate that traditional wave-particle duality is specifically limited by this identity. As a new consequence, we show that quantum duality itself can be amplified, attenuated, or turned completely off. In the Young double-slit context this quantum coherence identity is found to be directly relevant, and it supplies a rare quantitative backup for one of Bohr's philosophical pronouncements.