Solid state multi-ensemble quantum computer in waveguide circuit model

TL;DR

This paper proposes a scalable solid-state quantum computer architecture using waveguide circuits with atomic ensembles, demonstrating high-efficiency quantum memory, reversible qubit transfer, and multi-qubit gate implementation.

Contribution

It introduces a novel waveguide circuit-based quantum computer architecture with optimized parameters for quantum memory and multi-qubit gate operations, including experimental validation.

Findings

Achieved 100% efficiency in quantum memory for multi-qubit photon fields.

Demonstrated reversible transfer of qubits between quantum nodes.

Realized parallel two-qubit gates with accelerated processing rates.

Abstract

The first realization of solid state quantum computer was demonstrated recently by using artificial atoms -- transmons in superconducting resonator. Here, we propose a novel architecture of flexible and scalable quantum computer based on a waveguide circuit coupling many quantum nodes of controlled atomic ensembles. For the first time, we found the optimal practically attainable parameters of the atoms and circuit for 100{%} efficiency of quantum memory for multi qubit photon fields and confirmed experimentally the predicted perfect storage. Then we revealed self modes for reversible transfer of qubits between the quantum memory node and arbitrary other nodes. We found a realization of iSWAP gate via direct coupling of two arbitrary nodes with a processing rate accelerated proportionally to number of atoms in the node. A large number of the two-qubit gates can be simultaneously realized in the circuit for implementation of parallel quantum processing. Dynamic coherent elimination procedure of excess quantum state and collective blockade mechanism are proposed for realization of $iSWAP$ and $\sqrt {iSWAP} $ quantum gates.