Large Spin Stern-Gerlach Interferometry for Gravitational Entanglement

• URL: http://arxiv.org/abs/2312.05170v1
• Date: Fri, 8 Dec 2023 16:50:19 GMT
• Title: Large Spin Stern-Gerlach Interferometry for Gravitational Entanglement
• Authors: Lorenzo Braccini, Martine Schut, Alessio Serafini, Anupam Mazumdar, Sougato Bose
• Abstract summary: A proposal to test the quantum nature of gravity in the laboratory is presented. Two masses in spatial quantum superpositions are left to interact via gravity, and the entanglement is computed. We find that larger spins can offer a modest advantage in enhancing gravity-induced entanglement.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recently, there has been a proposal to test the quantum nature of gravity in the laboratory by witnessing the growth of entanglement between two masses in spatial quantum superpositions. The required superpositions can be created via Stern-Gerlach interferometers, which couple an embedded spin qubit quantum state to the spatial dynamics of each mass. The masses would entangle only if gravity is quantum in nature. Here, we generalise the experiment to an arbitrary spin $j$ or equivalently to an ensemble of uniformly coupled spins. We first exemplify how to create a generalized Stern-Gerlach interferometer, which splits the mass into $2j+1$ trajectories. This shows that a controlled protocol can be formulated to encode the amplitudes of any spin state to a spatial superposition. Secondly, two masses in spatial superpositions of the above form are left to interact via gravity, and the entanglement is computed. Different families of initial spin states are varied to find the optimal spin state that maximizes the entanglement. We conclude that larger spins can offer a modest advantage in enhancing gravity-induced entanglement.

Related papers

• Gravitationally Mediated Entanglement with Superpositions of Rotational Energies [0.0]
  Experimental proposals for testing quantum gravity-induced entanglement of masses (QGEM) typically involve two interacting masses which are each in a spatial superposition state. Here, we propose a QGEM experiment with two particles which are each in a superposition of rotational states, this amounts to a superposition of mass through mass-energy equivalence.
  arXiv  Detail & Related papers  (2024-03-04T14:05:36Z)
• Probing the curvature of the cosmos from quantum entanglement due to gravity [0.0]
  We find that the curvature of the background spacetime leaves its imprints on the resulting entanglement profile. This opens up an exciting new avenue of measuring the local expansion rate of the cosmos.
  arXiv  Detail & Related papers  (2023-11-09T16:18:25Z)
• Open Quantum System Approach to the Gravitational Decoherence of Spin-1/2 Particles [0.0]
  This paper investigates the decoherence effect resulting from the interaction of squeezed gravitational waves with a system of massive particles in spatial superposition. We first employ the open quantum system approach to obtain the established decoherence in a spatial superposition of massive objects induced by squeezed gravitational waves.
  arXiv  Detail & Related papers  (2023-09-12T16:54:47Z)
• Testing the nonclassicality of gravity with the field of a single delocalized mass [55.2480439325792]
  A setup is proposed that is based on a single delocalized mass coupled to a harmonically trapped test mass. We investigate the in-principle feasibility of such an experiment, which turns out to crucially depend on the ability to tame Casimir-Polder forces.
  arXiv  Detail & Related papers  (2023-07-18T15:40:16Z)
• Does the Universe have its own mass? [62.997667081978825]
  The mass of the universe is a distribution of non-zero values of gravitational constraints. A formulation of the Euclidean quantum theory of gravity is also proposed to determine the initial state. Being unrelated to ordinary matter, the distribution of its own mass affects the geometry of space.
  arXiv  Detail & Related papers  (2022-12-23T22:01:32Z)
• Spatial Qubit Entanglement Witness for Quantum Natured Gravity [0.0]
  We show that simple position correlation measurements can yield a spatial qubit witness of entanglement between the masses. We find that a significant squeezing at a specific stage of the protocol is the principal new requirement.
  arXiv  Detail & Related papers  (2022-11-07T16:18:05Z)
• Catapulting towards massive and large spatial quantum superposition [0.0]
  Large spatial quantum superposition of size $cal O (1-10)rm mu textm$ for mass $m sim 10-17-10-14textkg$ is required to probe the foundations of quantum mechanics. We will show that it is possible to accelerate the two spin states of a macroscopic nano-crystal sourced by the inhomogeneous nonlinear magnetic field in the Stern-Gerlach type setup.
  arXiv  Detail & Related papers  (2022-06-08T18:00:12Z)
• Manipulation of gravitational quantum states of a bouncing neutron with the GRANIT spectrometer [44.62475518267084]
  The GRANIT apparatus is the first physics experiment connected to a superthermal helium UCN source. We report on the methods developed for this instrument showing how specific GQS can be favored using a step between mirrors and an absorbing slit.
  arXiv  Detail & Related papers  (2022-05-23T08:37:28Z)
• Gravitational waves affect vacuum entanglement [68.8204255655161]
  The entanglement harvesting protocol is an operational way to probe vacuum entanglement. Using this protocol, it is demonstrated that while the transition probability of an individual atom is unaffected by the presence of a gravitational wave, the entanglement harvested by two atoms depends sensitively on the frequency of the gravitational wave. This suggests that the entanglement signature left by a gravitational wave may be useful in characterizing its properties, and potentially useful in exploring the gravitational-wave memory effect and gravitational-wave induced decoherence.
  arXiv  Detail & Related papers  (2020-06-19T18:01:04Z)
• Gravity Probe Spin: Prospects for measuring general-relativistic precession of intrinsic spin using a ferromagnetic gyroscope [51.51258642763384]
  An experimental test at the intersection of quantum physics and general relativity is proposed. The behavior of intrinsic spin in spacetime is an experimentally open question. A measurement is possible by using mm-scale ferromagnetic gyroscopes in orbit around the Earth.
  arXiv  Detail & Related papers  (2020-06-16T17:18:44Z)
• Atom-interferometric test of the universality of gravitational redshift and free fall [48.82541018696971]
  Light-pulse atom interferometers constitute powerful quantum sensors for inertial forces. We present a specific geometry which together with state transitions leads to a scheme that is sensitive to both violations of the universality of free fall and gravitational redshift.
  arXiv  Detail & Related papers  (2020-01-27T13:35:30Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.