Loophole free interferometric test of macrorealism using heralded single photons
arXiv:2105.11881 · doi:10.1103/PRXQuantum.3.010307
Abstract
We show unambiguous violations of different macrorealist inequalities, like the LGI and the WLGI using a heralded, single-photon based experimental setup comprising one Mach-Zehnder interferometer followed by a displaced Sagnac one. The negative result measurements (NRM) are implemented in order to validate the presumption of non-invasive measurability used in defining macrorealism. Among all the experiments to date testing macrorealism, the present experiment stands out in comprehensively addressing the relevant loopholes. The clumsiness loophole is addressed through precision testing of any classical invasiveness involved in the implementation of NRMs. This is done by suitably choosing the experimental parameters so that the quantum mechanically (QM) predicted validity of all the relevant two-time no-signalling in time (NSIT) conditions is maintained in all the three pairwise experiments performed to show LGI/WLGI violation. Further, importantly, the detection efficiency loophole is addressed by adopting suitable modifications in the measurement strategy enabling the demonstration of the violation of LGI/WLGI for any non-zero detection efficiency. We also show how other relevant loopholes like the multiphoton emission loophole, coincidence loophole, and the preparation state loophole are all closed in the present experiment. We report the LGI violation of and the WLGI violation of , where the magnitudes of violation are respectively 8 times and 5 times the corresponding error values, while agreeing perfectly with the ranges of the QM predicted values of the LGI, WLGI expressions that we estimate by taking into account the non-idealities of the actual experiment. Simultaneously, the experimentally observed probabilities satisfy all the two-time NSIT conditions up to the order of , which ensures non-invasiveness in the implemented NRMs.
arXiv comment31 pages, 7 figures, version to appear in PRX Quantum
References in corpus (36)
- Significant-loophole-free test of Bell's theorem with entangled photons
- A strong loophole-free test of local realism
- Leggett-Garg Inequalities
- Experimental violation of a Bell's inequality in time with weak measurement
- Witnessing Quantum Coherence: from solid-state to biological systems
- Violation of the Leggett-Garg inequality with weak measurements of photons
- Weak values and the Leggett-Garg inequality in solid-state qubits
- Violation of a Leggett-Garg inequality with ideal non-invasive measurements
- Experimental Violation of Two-Party Leggett-Garg Inequalities with Semi-weak Measurements
- Condition for macroscopic realism beyond the Leggett-Garg inequalities
- Ideal negative measurements in quantum walks disprove theories based on classical trajectories
- Opening up the Quantum Three-Box Problem with Undetectable Measurements
- Violation of the Leggett-Garg Inequality in Neutrino Oscillations
- A strict experimental test of macroscopic realism in a superconducting flux qubit
- Quantum nonlocality, Bell inequalities and the memory loophole
- No Fine theorem for macrorealism: Limitations of the Leggett-Garg inequality
- Violation of Leggett-Garg inequalities in quantum measurements with variable resolution and back-action
- Bell's inequality and the coincidence-time loophole
- Addressing the clumsiness loophole in a Leggett-Garg test of macrorealism
- Necessary and sufficient conditions for macroscopic realism from quantum mechanics
- Experimental violation of the Leggett-Garg inequality under decoherence
- Violation of Entropic Leggett-Garg Inequality in Nuclear Spins
- Quantum Entanglement in Time
- Experimental test of non-macrorealistic cat-states in the cloud
- Wigner's form of the Leggett-Garg inequality, No-Signalling in Time, and Unsharp Measurements
- Comparing Conditions for Macrorealism: Leggett-Garg Inequalities vs No-Signaling in Time
- The Leggett-Garg inequality in electron interferometers
- Information-theoretic temporal Bell inequality and quantum computation
- Interference experiment, anomalous weak value and Leggett-Garg test of macrorealism
- qkdSim: An experimenter's simulation toolkit for QKD with imperfections, and its performance analysis with a demonstration of the B92 protocol using heralded photon
- Near-100 % two-photon-like coincidence-visibility dip with classical light and the role of complementarity
- Ambiguous measurements, signalling and violations of Leggett-Garg inequalities
- Leggett-Garg tests for macrorealism: interference experiments and the simple harmonic oscillator
- Leggett-Garg tests of macrorealism: checks for non-invasiveness and generalizations to higher-order correlators
- Violations of a Leggett-Garg inequality without signalling for a photonic qutrit probed with ambiguous measurements
- Quantum State Interferography
Cited by in corpus (15)
- Quantifying Quantumness of Channels Without Entanglement
- Leggett-Garg Macrorealism and temporal correlations
- Single system based generation of certified randomness using Leggett-Garg inequality
- Maxwell's two-demon engine under pure dephasing noise
- Essential role of quantum speed limit in violation of Leggett-Garg inequality across a PT-transition
- Leggett-Garg violations for continuous variable systems with gaussian states
- Mass-Independent Scheme to Test the Quantumness of a Massive Object
- Certification of unbounded randomness with arbitrary noise
- Applications of Certified Randomness
- Certified Random Number Generation using Quantum Computers
- Role of nonclassical temporal correlation in powering quantum random access codes
- Leggett-Garg inequalities for multitime processes
- Imprints of LGI violation in Mesons
- Classical model of quantum interferometry tests of macrorealism
- Shared randomness allows violation of macroscopic realism using a single measurement