We measure a set of tomographically complete settings, that also spans the Tailor different causal witnesses directly for our experiment.

By reconstructing the process matrix, we estimate its fidelity and Our new architecture for the quantum SWITCH can be readily scaled to multiple Passively-stable fiber-based quantum SWITCH using active optical elements toĭeterministically generate and manipulate time-bin encoded qubits. We overcome this challenge by creating a new However, doing so requires exponentially many measurements with a scaling worse Here, we perform higher-order quantum process tomography. Resource advantages, but the complete process matrix has only been described SWITCH has confirmed its ICO by measuring causal witnesses or demonstrating To date, no higher-order quantum operation has beenĬompletely experimentally characterized. Operation, in that it not only transforms quantum states, but also other The quantum SWITCH is also an example of a higher-order quantum Quantum protocols, and is exciting for its relation to issues in foundational Multiple parties act in a superposition of different orders in a manner Much of this research has focused on the quantum SWITCH, wherein Download a PDF of the paper titled Higher-order Process Matrix Tomography of a passively-stable Quantum SWITCH, by Michael Antesberger and 3 other authors Download PDF Abstract: The field of indefinite causal order (ICO) has seen a recent surge in

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