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Noise can surprisingly drive quantum synchronization in superconducting qubits. This study observed noise-induced synchronization and entanglement in a qubit chain, showing noise

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Area of Science:

  • Quantum physics
  • Complex systems
  • Condensed matter physics

Background:

  • Complex systems can exhibit cooperative effects due to random fluctuations.
  • Quantum systems, such as superconducting qubits, are typically studied under controlled conditions, minimizing noise.

Purpose of the Study:

  • To investigate the phenomenon of noise-induced quantum synchronization in a chain of superconducting transmon qubits.
  • To explore the entanglement properties of synchronized qubits and the stability of synchronization and entanglement.

Main Methods:

  • Utilizing a chain of superconducting transmon qubits with nearest-neighbor interactions.
  • Applying Gaussian white noise to a single site of the qubit chain.
  • Analyzing qubit oscillations, entanglement (concurrence), and stability using generalized Arnold tongue diagrams.

Main Results:

  • Observed noise-induced quantum synchronization across the entire qubit chain initiated by noise on a single site.
  • Demonstrated entanglement between the two synchronized end qubits, identifying them as maximally entangled mixed states.
  • Showcased the stability of both synchronization and entanglement against frequency detuning.

Conclusions:

  • Noise can have a constructive influence, leading to collective synchronization and entanglement in quantum many-body systems.
  • This work opens avenues for exploring quantum synchronization with correlations exceeding classical limits.
  • The findings highlight the potential of engineered noise in controlling quantum systems.