Decoherence-Free Interaction between Giant Atoms in Waveguide Quantum Electrodynamics

2017/11/24 by Anton Frisk Kockum, Göran Johansson, Franco Nori · 2 citations
Computer Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Decoherence-free subspaces #Dephasing #Physics #Quantum #Quantum Information and Cryptography #Quantum Zeno effect #Quantum computer #Quantum decoherence #Quantum entanglement #Quantum error correction #Quantum information #Quantum mechanics #Quantum optics #Quantum optics and atomic interactions #Qubit #Waveguide #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physrevlett.120.140404

published as Phys. Rev. Lett. 120, 140404 (2018) · 8+20 pages, 4+8 figures, 1 table

arxiv created 2017/11/24 · openalex publication_date 2018/04/05 · arxiv updated 2018/04/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In quantum-optics experiments with both natural and artificial atoms, the atoms are usually small enough that they can be approximated as pointlike compared to the wavelength of the electromagnetic radiation with which they interact. However, superconducting qubits coupled to a meandering transmission line, or to surface acoustic waves, can realize "giant artificial atoms" that couple to a bosonic field at several points which are wavelengths apart. Here, we study setups with multiple giant atoms coupled at multiple points to a one-dimensional (1D) waveguide. We show that the giant atoms can be protected from decohering through the waveguide, but still have exchange interactions mediated by the waveguide. Unlike in decoherence-free subspaces, here the entire multiatom Hilbert space (2^N states for N atoms) is protected from decoherence. This is not possible with "small" atoms. We further show how this decoherence-free interaction can be designed in setups with multiple atoms to implement, e.g., a 1D chain of atoms with nearest-neighbor couplings or a collection of atoms with all-to-all connectivity. This may have important applications in quantum simulation and quantum computing.

Citations

• Digital quantum simulation of spin models with circuit quantum electrodynamics
• Spontaneous emission of an atom in front of a mirror
• Dynamics of Coherent and Incoherent Emission from an Artificial Atom in a 1D Space
• Propagating phonons coupled to an artificial atom
• Measurement-based quantum computation
• Photon-mediated interaction between two distant atoms
• Dynamics of spontaneous emission in a single-end photonic waveguide
• Photon-mediated interactions between distant artificial atoms
• Coupling superconducting qubits via a cavity bus
• Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime
• Quantum nonlinear optics without photons
• Probing many-body dynamics on a 51-atom quantum simulator
• Photonic band structure of two-dimensional atomic lattices
• Qubit-assisted transduction for a detection of surface acoustic waves near the quantum limit
• Quantum Simulators

Cited by

• Giant-atom-enabled quantum optics with valley-polarized photons
• Dressed Interference in Giant Superatoms: Entanglement Generation and Transfer

Related

• Waveguide Quantum Electrodynamics with Giant Superconducting Artificial Atoms
• Decoherence-free interaction and maximally entangled state generation in double-giant-atom semi-infinite waveguide systems
• Strongly coupled giant-atom waveguide quantum electrodynamics
• Amplifying Decoherence-Free Many-Body Interactions with Giant Atoms Coupled to Parametric Waveguide
• Interaction between giant atoms in a one-dimensional topological waveguide