On-chip quantum interference of a superconducting microsphere

Pino, H, Prat-Camps, J, Sinha, K, Venkatesh, B Prasanna and Romero-Isart, O (2018) On-chip quantum interference of a superconducting microsphere. Quantum Science and Technology, 3 (025001). ISSN 2058-9565

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We propose and analyze an all-magnetic scheme to perform a Young's double slit experiment with a micron-sized superconducting sphere of mass $\gtrsim {10}^{13}$ amu. We show that its center of mass could be prepared in a spatial quantum superposition state with an extent of the order of half a micrometer. The scheme is based on magnetically levitating the sphere above a superconducting chip and letting it skate through a static magnetic potential landscape where it interacts for short intervals with quantum circuits. In this way, a protocol for fast quantum interferometry using quantum magnetomechanics is passively implemented. Such a table-top earth-based quantum experiment would operate in a parameter regime where gravitational energy scales become relevant. In particular, we show that the faint parameter-free gravitationally-induced decoherence collapse model, proposed by Diósi and Penrose, could be unambiguously falsified.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Informatics
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Jordi Prat Camps
Date Deposited: 24 Apr 2018 13:36
Last Modified: 02 Jul 2019 16:00
URI: http://sro.sussex.ac.uk/id/eprint/75369

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