Bidirectional multi-photon communication between remote superconducting nodes

Abstract

Quantum communication testbeds provide a useful resource for experimentally investigating a variety of communication protocols. Here we demonstrate a superconducting circuit testbed with bidirectional multi-photon state transfer capability using time-domain shaped wavepackets. The system we use to achieve this comprises two remote nodes, each including a tunable superconducting transmon qubit and a tunable microwave-frequency resonator, linked by a 2 m-long superconducting coplanar waveguide, which serves as a transmission line. We transfer both individual and superposition Fock states between the two remote nodes, and additionally show that this bidirectional state transfer can be done simultaneously, as well as used to entangle elements in the two nodes.

Main Paper has 6 pages, 4 figures. Supplementary has 14 pages, 16 figures, 2 tables

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• Generation of Frequency-Tunable Shaped Single Microwave Photons Using a Fixed-Frequency Superconducting Qubit
• Deterministic generation of frequency-bin-encoded microwave photons
• WaveguideQED.jl: An Efficient Framework for Simulating Non-Markovian Waveguide Quantum Electrodynamics
• Time-delayed collective dynamics in waveguide QED and bosonic quantum networks
• Engineering nonlinear boson-boson interactions using mediating spin systems
• Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators