Leggett-Garg test of macrorealism using indefinite causal order of measurements
arXiv:2311.04484 · doi:10.1016/j.physleta.2023.128898
Abstract
Macrorealism is a belief that constitutes the core of our perception of reality in the everyday world. The Leggett-Garg (LG) test is a conceptually elegant approach for probing the compatibility between the notion of macrorealism and quantum theory. However, a conclusive LG test hinges on how one fixes the operational invasiveness loophole, i.e., how the statistical form of non-invasive measurability assumption is guaranteed in an LG test. Despite many attempts to close this loophole, no consensus has been achieved yet. In this work, we propose a simple and elegant scheme based on indefinite causal order in quantum switch experiment, which enables us to close this loophole, and eventually, the LG test becomes a conclusive test of macrorealism.
References in corpus (25)
- Dynamical Reduction Models
- Contextuality for preparations, transformations, and unsharp measurements
- Quantum computations without definite causal structure
- Experimental violation of a Bell's inequality in time with weak measurement
- Direct measurement of general quantum states using weak measurement
- Negativity and contextuality are equivalent notions of nonclassicality
- Violation of the Leggett-Garg inequality with weak measurements of photons
- Indefinite Causal Order in a Quantum Switch
- Classical world arising out of quantum physics under the restriction of coarse-grained measurements
- Experimental Violation of Two-Party Leggett-Garg Inequalities with Semi-weak Measurements
- Quasi-probability representations of quantum theory with applications to quantum information science
- A strict experimental test of macroscopic realism in a superconducting flux qubit
- Quantum Advantage in Postselected Metrology
- Quantum theory of successive projective measurements
- No Fine theorem for macrorealism: Limitations of the Leggett-Garg inequality
- Addressing the clumsiness loophole in a Leggett-Garg test of macrorealism
- Necessary and sufficient conditions for macroscopic realism from quantum mechanics
- The Leggett-Garg Inequalities and No-Signalling in Time: A Quasi-Probability Approach
- Leggett-Garg macrorealism and the quantum nondisturbance conditions
- Anomalous Weak Values and the Violation of a Multiple-measurement Leggett-Garg Inequality
- Exploration of an augmented set of Leggett-Garg inequalities using a noninvasive continuous-in-time velocity measurement
- Detecting violations of macrorealism when the original Leggett-Garg inequalities are satisfied
- Leggett-Garg tests for macrorealism: interference experiments and the simple harmonic oscillator
- Fine's Theorem for Leggett-Garg tests with an arbitrary number of measurement times
- On the violation of Lders bound of macrorealist and noncontextual inequalities