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Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions.

C Wan1, M Scala1, G W Morley2

  • 1QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom.

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This summary is machine-generated.

We demonstrate a novel quantum superposition scheme for massive nano-objects, using gravity and spin control to achieve macroscopic delocalization. This method shows high immunity to noise, enabling tests of quantum gravity theories.

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Area of Science:

  • Quantum physics
  • Quantum mechanics
  • Experimental physics

Background:

  • Generating macroscopic quantum superposition is a key challenge in quantum mechanics.
  • Testing quantum mechanics in the regime of massive objects and gravity is crucial for understanding quantum-to-classical transitions.

Purpose of the Study:

  • To propose and theoretically validate an interferometric scheme for creating macroscopic spatial superposition of a massive nano-object.
  • To investigate the potential of this scheme for testing fundamental physics, including gravity-related quantum effects and continuous spontaneous localization.

Main Methods:

  • An interferometric scheme coupling the center of mass motion of a free nano-object to its internal spin system via magnetic interaction.
  • Utilizing coherent spin control and a spin-dependent force to induce spatial delocalization of the object's wave packet.
  • Employing a Ramsey spectroscopy scheme to measure a gravity-induced dynamical phase accrued on the spin state.

Main Results:

  • The proposed scheme enables the creation of a spatially delocalized superposition of the spin-nano-object composite system.
  • The scheme exhibits remarkable immunity to motional noise and possesses inherent dynamical decoupling properties, ensuring high fringe visibility.
  • The mass-independent nature of the scheme allows for its application to nano-objects with significant mass variability.
  • Achievable spatial separation of 100 nm for a 10^9 amu object is predicted.

Conclusions:

  • The developed scheme provides a viable experimental pathway towards generating and observing macroscopic quantum superposition in massive objects.
  • This approach offers a novel route for experimentally probing quantum gravity and testing theories of continuous spontaneous localization.