Can the displacemon device test objective collapse models?
arXiv:2110.15180 · doi:10.1116/5.0073626
Abstract
Testing the limits of the applicability of quantum mechanics will deepen our understanding of the universe and may shed light on the interplay between quantum mechanics and gravity. At present there is a wide range of approaches for such macroscopic tests spanning from matter-wave interferometry of large molecules to precision measurements of heating rates in the motion of micro-scale cantilevers. The "displacemon" is a proposed electromechanical device consisting of a mechanical resonator flux-coupled to a superconducting qubit enabling generation and readout of mechanical quantum states. In the original proposal, the mechanical resonator was a carbon nanotube, containing nucleons. Here, in order to probe quantum mechanics at a more macroscopic scale, we propose using an aluminium mechanical resonator on two larger mass scales, one inspired by the Marshall-Simon-Penrose-Bouwmeester moving-mirror proposal, and one set by the Planck mass. For such a device, we examine the experimental requirements needed to perform a more macroscopic quantum test and thus feasibly detect the decoherence effects predicted by two objective collapse models: Diósi-Penrose and continuous spontaneous localization. Our protocol for testing these two theories takes advantage of the displacemon architecture to create non-Gaussian mechanical states out of equilibrium with their environment and then analyzing the measurement statistics of a superconducting qubit. We find that with improvements to the fabrication and vibration sensitivities of these electromechanical devices, the displacemon device provides a new route to feasibly test decoherence mechanisms beyond standard quantum theory.
arXiv comment16 pages, 5 figures
References in corpus (40)
- Charge insensitive qubit design derived from the Cooper pair box
- A Quantum Engineer's Guide to Superconducting Qubits
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Models of Wave-function Collapse, Underlying Theories, and Experimental Tests
- Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
- Towards quantum superpositions of a mirror
- Entangled massive mechanical oscillators
- Controlling the spontaneous emission of a superconducting transmon qubit
- Testing the limits of quantum mechanical superpositions
- Mechanical systems in the quantum regime
- Gravitation and quantummechanical localization of macroobjects
- Matter-wave interferometer for large molecules
- Matter-wave interference with particles selected from a molecular library with masses exceeding 10000 amu
- A Scheme to Probe the Decoherence of a Macroscopic Object
- Pulsed quantum optomechanics
- Near-field interferometry of a free-falling nanoparticle from a point-like source
- Lower and Upper Bounds on CSL Parameters from Latent Image Formation and IGM Heating
- Underground test of gravity-related wave function collapse
- Optomechanical sensing of spontaneous wave-function collapse
- Creating and Verifying a Quantum Superposition in a Micro-optomechanical System
- Non-interferometric Test of Collapse Models in Optomechanical Systems
- Heating of trapped ultracold atoms by collapse dynamics
- Exploring the unification of quantum theory and general relativity with a Bose-Einstein condensate
- Narrowing the parameter space of collapse models with ultracold layered force sensors
- Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment
- Photon emission rate from atomic systems in the CSL model
- Discriminating the effects of collapse models from environmental diffusion with levitated nanospheres
- Pulsed entanglement of two optomechanical oscillators
- A macroscopic object passively cooled into its quantum ground state of motion: beyond single-mode cooling
- Displacemon electromechanics: how to detect quantum interference in a nanomechanical resonator
- Entangling macroscopic diamonds at room temperature: Bounds on the continuous-spontaneous-localization parameters
- Growing macroscopic superposition states via cavity quantum optomechanics
- Generation of mechanical interference fringes by multi-photon counting
- Superconducting electro-mechanics to test Diósi-Penrose effects of general relativity in massive superpositions
- Large flux-mediated coupling in hybrid electromechanical system with a transmon qubit
- Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
- Collapse in ultracold Bose Josephson junctions
- Current tests of collapse models: How far can we push the limits of quantum mechanics?
- CSL reduction rate for rigid bodies
- Laser cooling of a Planck mass object close to the quantum ground state