Controlling Markovianity with Chiral Giant Atoms

Abstract

Giant artificial atoms are promising and flexible building blocks for the implementation of analog quantum simulators. They are realized via a multi-local pattern of couplings of two-level systems to a waveguide, or to a two-dimensional photonic bath. A hallmark of giant-atom physics is their non-Markovian character in the form of self-coherent feedback, leading, e.g., to non-exponential atomic decay. The timescale of their non-Markovianity is essentially given by the time delay proportional to the distance between the various coupling points. In parallel, with the state-of-the-art experimental setups, it is possible to engineer complex phases in the atom-light couplings. Such phases simulate an artificial magnetic field, yielding a chiral behavior of the atom-light system. Here, we report a surprising connection between these two seemingly unrelated features of giant atoms, showing that the chirality of a giant atom controls its Markovianity. In particular, by adjusting the couplings' phases, a giant atom can, counterintuitively, enter an exact Markovian regime irrespectively of any inherent time delay. We illustrate this mechanism as an interference process and via a collision model picture. Our findings significantly advance the understanding of giant atom physics, and open new avenues for the control of quantum nanophotonic networks.

4+8 pages, 3+1 figures. Close to published version

References in corpus (25)

• Chiral Quantum Optics
• Theory of single-photon transport in a single-mode waveguide coupled to a cavity containing a two-level atom
• Decoherence-free interaction between giant atoms in waveguide QED
• Waveguide Quantum Electrodynamics with Giant Superconducting Artificial Atoms
• Quantum collision models: open system dynamics from repeated interactions
• Nonexponential decay of a giant artificial atom
• Unconventional quantum optics in topological waveguide QED
• Quantum electrodynamics in a topological waveguide
• Exciting a Bound State in the Continuum through Multi-Photon Scattering plus Delayed Quantum Feedback
• Demonstration of non-Markovian process characterisation and control on a quantum processor
• Dynamics of spontaneous emission in a single-end photonic waveguide
• Non-Markovian Dynamics in Chiral Quantum Networks with Spins and Photons
• Markovian and Non-Markovian Dynamics of Quantum Emitters coupled to Two-dimensional Structured Reservoirs
• Mechanism of decoherence-free coupling between giant atoms
• A scalable superconducting quantum simulator with long-range connectivity based on a photonic bandgap metamaterial
• Non-Markovianity of a quantum emitter in front of a mirror
• Collision models in quantum optics
• Vacancy-like dressed states in topological waveguide QED
• Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators
• When is a non-Markovian quantum process classical?
• Collisional picture of quantum optics with giant emitters
• Controllable Non-Markovianity for a Spin Qubit in Diamond
• Non-Markovian Dynamics of a Qubit Due to Single-Photon Scattering in a Waveguide
• Tuning non-Markovianity by spin-dynamics control
• Chiral coupling between a ferromagnetic magnon and a superconducting qubit

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• Simulating open quantum systems with giant atoms
• Simulating and probing many-body quantum states in waveguide-QED systems with giant atoms
• Floquet Engineering and Harnessing Giant Atoms in Frequency-Comb Emission and Bichromatic Correlations in Waveguide QED
• Interplay between external driving, dissipation and collective effects in the Markovian and non-Markovian regimes
• Scalable quantum simulator with an extended gate set in giant atoms
• Giant atoms coupled to waveguide: Continuous coupling and multiple excitations
• Unidirectional exceptional point of reflectionless states in a magnonic mirror array
• Selective band interaction and long-range hopping in a structured environment with giant atoms
• Chirality, Nonreciprocity and Symmetries for a Giant Atom
• Oscillating bound states in waveguide-QED system with two giant atoms
• Nonreciprocal routing induced by chirality in an atom-dimer waveguide-QED system
• Engineering giant transmon molecules as mediators of conditional two-photon gates
• Strongly coupled giant-atom waveguide quantum electrodynamics