Control of Localized Multiple Excitation Dark States in Waveguide QED

Abstract

Subradiant excited states in finite chains of two-level quantum emitters coupled to a one-dimensional reservoir are a resource for superior photon storage and controlled photon manipulation. Typically, states storing multiple excitations exhibit fermionic correlations and are thus characterized by an anti-symmetric wavefunction, which makes them hard to prepare experimentally. Here we identify a class of quasi-localized dark states with up to half of the qubits excited, which appear for lattice constants that are an integer multiple of the guided-mode wavelength. They allow for a high-fidelity preparation and minimally invasive read out in state-of-the-art setups. In particular, we suggest an experimental implementation using a coplanar wave-guide coupled to superconducting transmon qubits on a chip. As free space and intrinsic losses are minimal, virtually perfect dark states can be achieved even for a low number of qubits, enabling fast preparation and manipulation with high fidelity.

11 pages, 6 figures

References in corpus (7)

• Photon-mediated interactions between distant artificial atoms
• Cooperative eigenmodes and scattering in 1D atomic arrays
• Slowing down light in a qubit metamaterial
• Sub-radiant states for imperfect quantum emitters coupled by a nanophotonic waveguide
• Collective bosonic effects in an array of transmon devices
• Classification of three-photon states in waveguide quantum electrodynamics
• Directional transport along an atomic chain

Cited by in corpus (16)

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• Unraveling superradiance: Entanglement and mutual information in collective decay
• Tunable photon scattering by an atom dimer coupled to a band edge of a photonic crystal waveguide
• Subradiance and Superradiant Long Range Excitation Transport among Quantum Emitter Ensembles in a Waveguide
• Dark-state engineering in Fock-state lattices
• Dark-state photonic entanglement filters
• Tunable ultrahigh reflection with broadband via collective atom-atom interaction in waveguide-QED system
• Collectively induced transparency and absorption in waveguide QED with Bragg atom arrays
• Spontaneous Emission in the presence of Quantum Mirrors
• Phase-Space Methods for Many-Body Quantum Optics
• Fast and High Excitation Transport in Waveguide Quantum Electrodynamics
• Excitation transfer and many-body dark states in waveguide quantum electrodynamics
• Reflection by two level system: phase singularities on the Poincaré hypersphere