The authors experimentally demonstrate time-delocalized local measurements inside a photonic quantum switch that preserve indefinite causal order, achieving a causal witness value of C_W ≈ -0.305(1).
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Two-photon parametric amplification in a superconducting circuit exponentially strengthens cavity-qubit coupling, enabling faster charging and decoherence-resistant energy storage in a quantum battery.
Loss in an auxiliary cavity induces nonreciprocal excitation exchange in a three-cavity quantum battery, yielding significantly higher steady-state energy in the battery than the charger.
Interference between local measurement histories on two qubits generates entanglement, persisting even after averaging over detector readouts.
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Time-Delocalized Local Measurements in an Indefinite Causal Order
The authors experimentally demonstrate time-delocalized local measurements inside a photonic quantum switch that preserve indefinite causal order, achieving a causal witness value of C_W ≈ -0.305(1).
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Quantum battery optimized by parametric amplification
Two-photon parametric amplification in a superconducting circuit exponentially strengthens cavity-qubit coupling, enabling faster charging and decoherence-resistant energy storage in a quantum battery.
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Loss-induced nonreciprocal quantum battery
Loss in an auxiliary cavity induces nonreciprocal excitation exchange in a three-cavity quantum battery, yielding significantly higher steady-state energy in the battery than the charger.
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Interference of local-measurement histories
Interference between local measurement histories on two qubits generates entanglement, persisting even after averaging over detector readouts.