Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials

TL;DR

This paper demonstrates that electromagnetic pulses can induce lattice coherence in superconducting quantum metamaterials, leading to phenomena like superradiance and self-induced transparency, which could advance quantum computing technologies.

Contribution

It introduces the concept of qubit lattice coherence and quantum breathers in superconducting metamaterials, a novel approach for quantum information processing.

Findings

Observation of qubit lattice coherence during light pulse propagation

Demonstration of superradiance and self-induced transparency in superconducting metamaterials

Potential for new quantum computing pathways

Abstract

Quantum bits (qubits) are at the heart of quantum information processing schemes. Currently, solid-state qubits, and in particular the superconducting ones, seem to satisfy the requirements for being the building blocks of viable quantum computers, since they exhibit relatively long coherence times, extremely low dissipation, and scalability. The possibility of achieving quantum coherence in macroscopic circuits comprising Josephson junctions, envisioned by Legett in the 1980's, was demonstrated for the first time in a charge qubit; since then, the exploitation of macroscopic quantum effects in low-capacitance Josephson junction circuits allowed for the realization of several kinds of superconducting qubits. Furthermore, coupling between qubits has been successfully achieved that was followed by the construction of multiple-qubit logic gates and the implementation of several algorithms. Here it is demonstrated that induced qubit lattice coherence as well as two remarkable quantum coherent optical phenomena, i.e., self-induced transparency and Dicke-type superradiance, may occur during light-pulse propagation in quantum metamaterials comprising superconducting charge qubits. The generated qubit lattice pulse forms a compound "quantum breather" that propagates in synchrony with the electromagnetic pulse. The experimental confirmation of such effects in superconducting quantum metamaterials may open a new pathway to potentially powerful quantum computing.