Demonstration of universal control between non-interacting qubits using the Quantum Zeno effect
Abstract
The Zeno effect occurs in quantum systems when a very strong measurement is applied, which can alter the dynamics in non-trivial ways. Despite being dissipative, the dynamics stay coherent within any degenerate subspaces of the measurement. Here we show that such a measurement can turn a single-qubit operation into a two- or multi-qubit entangling gate, even in a non-interacting system. We demonstrate this gate between two effectively non-interacting transmon qubits. Our Zeno gate works by imparting a geometric phase on the system, conditioned on it lying within a particular non-local subspace. These results show how universality can be generated not only by coherent interactions as is typically employed in quantum information platforms, but also by Zeno measurements.
Cite
@article{arxiv.2108.08549,
title = {Demonstration of universal control between non-interacting qubits using the Quantum Zeno effect},
author = {Eliya Blumenthal and Chen Mor and Asaf A. Diringer and Leigh S. Martin and Philippe Lewalle and Daniel Burgarth and K. Birgitta Whaley and Shay Hacohen-Gourgy},
journal= {arXiv preprint arXiv:2108.08549},
year = {2022}
}