Enhanced non-macrorealism: Extreme violations of Leggett-Garg inequalities for a system evolving under superposition of unitaries
arXiv:2411.02301 · doi:10.1103/vydp-9qqq
Abstract
Quantum theory contravenes classical macrorealism by allowing a system to be in a superposition of two or more physically distinct states, producing physical consequences radically different from that of classical physics. We show that a system, upon subjecting to transform under superposition of unitary operators, exhibits enhanced non-macrorealistic feature - as quantified by violation of the Leggett-Garg inequality (LGI) beyond the temporal Tsirelson bound. Moreover, this superposition of unitaries also provides robustness against decoherence by allowing the system to violate LGI and thereby retain its non-macrorealistic behavior for a strikingly longer duration. Using an NMR register, we experimentally demonstrate the superposition of unitaries with the help of an ancillary qubit and verify these theoretical predictions.
References in corpus (21)
- Decoherence, einselection, and the quantum origins of the classical
- Nuclear magnetic resonance spectroscopy: An experimentally accessible paradigm for quantum computing
- Experimental violation of a Bell's inequality in time with weak measurement
- The General Quantum Interference Principle and the Duality Computer
- Indefinite Causal Order in a Quantum Switch
- Testing contextuality on quantum ensembles with one clean qubit
- Violation of a temporal Bell inequality for single spins in solid by over 50 standard deviations
- Temporal quantum correlations and Leggett-Garg inequalities in multi-level systems
- Quantum correlations in the temporal CHSH scenario
- Bounding temporal quantum correlations
- Quantum Darwinism, Classical Reality, and the Randomness of Quantum Jumps
- NMR implementation of Quantum Delayed-Choice Experiment
- Violation of Entropic Leggett-Garg Inequality in Nuclear Spins
- Duality and Recycling Computing in Quantum Computers
- Experimental violation of the Leggett-Garg inequality in a 3-level system
- Enhanced violations of Leggett-Garg inequalities in an experimental three-level system
- Quantum Phase Transitions detected by a local probe using Time Correlations and Violations of Leggett-Garg Inequalities
- Algebraic maximum violation of the Leggett-Garg inequality in a two-level system under PT symmetric dynamics
- Essential role of quantum speed limit in violation of Leggett-Garg inequality across a PT-transition
- Experimental demonstration of enhanced violations of Leggett-Garg inequalities in a -symmetric trapped-ion qubit
- Observation of quantum temporal correlations well beyond Luders bound