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Area of Science:

  • Quantum physics
  • Quantum information science
  • Mechanical quantum systems

Background:

  • Mechanical systems are promising for quantum information applications.
  • Controlling phonons (quanta of mechanical vibrations) has advanced significantly.
  • While dual-resonator entanglement is achieved, complex entangled states remain challenging.

Purpose of the Study:

  • To demonstrate rapid multi-phonon entanglement generation.
  • To perform tomographic analysis of generated entangled states.
  • To utilize a scalable platform for complex mechanical quantum systems.

Main Methods:

  • Utilized a scalable platform with two surface acoustic wave resonators.
  • Connected each resonator to a superconducting qubit.
  • Generated and analyzed multi-phonon entangled states.

Main Results:

  • Synthesized a mechanical Bell state with high fidelity.
  • Created a multi-phonon entangled N = 2 N00N state with high fidelity.
  • Demonstrated a compact, modular, and scalable platform.

Conclusions:

  • The demonstrated platform enables rapid multi-phonon entanglement.
  • This work facilitates further advances in quantum control of complex mechanical systems.
  • The scalable architecture is key for future quantum information processing applications.