期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.090503
关键词
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资金
- Australian Research Council (ARC) by DECRA grants [DE170100712, DE160100409]
- Centre of Excellence for Engineered Quantum Systems (EQUS) [CE170100009]
- L 'Oreal-UNESCO For Women In Science grant
- Advance Queensland
- French National Research Agency by the Retour Post-Doctorants program [ANR-13-PDOC-0026]
- University of Queensland
- John Templeton Foundation
- Australian Research Council [DE160100409, DE170100712] Funding Source: Australian Research Council
Quantum mechanics allows events to happen with no definite causal order: this can be verified by measuring a causal witness, in the same way that an entanglement witness verifies entanglement. Here, we realize a photonic quantum switch, where two operations (A) over cap and (B) over cap act in a quantum superposition of their two possible orders. The operations are on the transverse spatial mode of the photons; polarization coherently controls their order. Our implementation ensures that the operations cannot be distinguished by spatial or temporal position-further it allows qudit encoding in the target. We confirm our quantum switch has no definite causal order by constructing a causal witness and measuring its value to be 18 standard deviations beyond the definite-order bound.
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