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Interacting Qubit-Photon Bound States with Superconducting Circuits.

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Researchers demonstrate tunable interactions between qubit-photon bound states in a superconducting microwave photonic crystal. This breakthrough enables the creation of 1D chains with controllable, long-range interactions for quantum simulations.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum optics

Background:

  • Qubit-photon bound states arise from strong coupling between qubits and photonic crystals.
  • These states are crucial for various quantum phenomena and can be controlled by qubit detuning.
  • Superconducting microwave photonic crystals offer a platform for studying these interactions.

Purpose of the Study:

  • To experimentally realize tunable on-site and interbound state interactions.
  • To investigate the potential of qubit-photon bound states for creating quantum spin models.
  • To demonstrate the feasibility of building larger, more complex quantum systems.

Main Methods:

  • Fabrication of a device with two transmon qubits coupled to a superconducting microwave photonic crystal.
  • Experimental manipulation of qubit detuning to control bound-state localization and interaction.
  • Observation of a fourth-order two-photon virtual process to confirm strong coupling.

Main Results:

  • Achieved tunable on-site and interbound state interactions.
  • Demonstrated a fourth-order two-photon virtual process, indicating strong qubit-photon coupling.
  • Showcased the ability to realize one-dimensional chains of bound states with tunable, long-range interactions.

Conclusions:

  • The demonstrated system provides a promising platform for building and studying quantum spin models.
  • Tunable and robust interactions are key for advancing towards larger, more complex quantum systems.
  • Qubit-photon bound states offer a pathway for controlled quantum information processing and simulation.