Semi-device-independent certification of indefinite causal order in a photonic quantum switch

Abstract

We report an experimental certification of indefinite causal order that relies only on the characterization of the operations of a single party. We do so in the semi-device-independent scenario with the fewest possible assumptions of characterization of the parties' local operations in which indefinite causal order can be demonstrated with the quantum switch. To achieve this result, we introduce the concept of semi-device-independent causal inequalities and show that the correlations generated in a photonic quantum switch, in which all parties are able to collect local outcome statistics, achieve a violation of this inequality of 224 standard deviations. This result consists of the experimental demonstration of indefinite causal order with the fewest device-characterization assumptions to date.

9 + 4 pages, 5 + 1 figures. Close to the published version

References in corpus (9)

• Gravitationally-induced entanglement between two massive particles is sufficient evidence of quantum effects in gravity
• Experimental criteria for steering and the Einstein-Podolsky-Rosen paradox
• Quantum Circuits Architecture
• Experimental Verification of an Indefinite Causal Order
• Towards Quantum Gravity: A Framework for Probabilistic Theories with Non-Fixed Causal Structure
• Experimentally feasible computational advantage from quantum superposition of gate orders
• Unitary channel discrimination beyond group structures: Advantages of sequential and indefinite-causal-order strategies
• Semi-Device-Independent Certification of Causal Nonseparability with Trusted Quantum Inputs
• Device-independent certification of indefinite causal order in the quantum switch

Cited by in corpus (12)

• Experimental Aspects of Indefinite Causal Order in Quantum Mechanics
• Higher-order Process Matrix Tomography of a passively-stable Quantum SWITCH
• Demonstration of a quantum SWITCH in a Sagnac configuration
• Reassessing thermodynamic advantage from indefinite causal order
• Experimental superposition of time directions
• Comparing the quantum switch and its simulations with energetically-constrained operations
• Memory in quantum processes with indefinite time direction and causal order
• Indefinite causal key distribution
• Toward an Experimental Device-Independent Verification of Indefinite Causal Order
• Possibilistic and maximal indefinite causal order in the quantum switch
• Simulating the quantum switch with quantum circuits is computationally hard
• Entropic uncertainty under indefinite causal order and input-output direction