Probing macroscopic realism via Ramsey correlations measurements

Abstract

We describe a new and experimentally feasible protocol for performing fundamental tests of quantum mechanics with massive objects. In our approach a single two level system is used to probe the motion of a nanomechanical resonator via multiple Ramsey interference measurements. This scheme enables the measurement of modular variables of macroscopic continuous variable systems and we show that correlations thereof violate a Leggett-Garg inequality and can be applied for tests of quantum contextuality. Our method can be implemented with a variety of different solid state or photonic qubit-resonator systems and provides a clear experimental signature to distinguish the predictions of quantum mechanics from those of other alternative theories at a macroscopic scale.

5 pages plus Supplementary Material. Published in Phys. Rev. Lett

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• Enhanced violations of Leggett-Garg inequalities in an experimental three-level system
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• Leggett-Garg tests for macrorealism: interference experiments and the simple harmonic oscillator
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• Leggett-Garg tests of macro-realism for multi-particle systems including double-well Bose-Einstein condensates
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• Open Quantum System Approach to the Gravitational Decoherence of Spin-1/2 Particles
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• Proposal for a macroscopic test of local realism with phase-space measurements
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• Heralded entangled coherent states between spatially separated massive resonators
• Mesoscopic and macroscopic quantum correlations in photonic, atomic and optomechanical systems
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• Proposal for a quantum delayed-choice experiment with a spin-mechanical setup
• Violation of the two-time Leggett-Garg inequalities for a harmonic oscillator
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• High fidelity macroscopic superposition states via shortcut to adiabaticity
• Entanglement of temporal sections as quantum histories and their quantum correlation bounds
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• Classicalization of Quantum State of Detector by Amplification Process
• Neither weak nor strong entropic Leggett-Garg inequalities can be violated
• Arbitrarily large violations of non-contextuality in single mode photon states with positive Wigner function
• Light polarization measurements in tests of macrorealism
• Operational quasiprobabilities for continuous variables