Sequential device-independent certification of indefinite causal order
- URL: http://arxiv.org/abs/2307.13477v1
- Date: Tue, 25 Jul 2023 13:10:57 GMT
- Title: Sequential device-independent certification of indefinite causal order
- Authors: Zhu Cao
- Abstract summary: We study the sequential DI certification of an indefinite causal order.
We show that an arbitrary number of sequential DI certifications of an indefinite causal order can be achieved with a quantum switch.
Our work opens the possibility of reusing the resource of an indefinite causal order multiple times in device-independent quantum information processing.
- Score: 1.3706331473063877
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Indefinite causal order has found numerous applications in quantum
computation, quantum communication, and quantum metrology. Before its usage,
the quality of the indefinite causal order needs to be first certified, and the
certification should ideally be device-independent (DI) to avoid the impact of
device imperfections. In this work, we initiate the study of the sequential DI
certification of an indefinite causal order. This can be useful in experimental
platforms where the generation of an indefinite causal order is difficult. We
show that an arbitrary number of sequential DI certifications of an indefinite
causal order can be achieved with a quantum switch and also analyze practical
requirements for experimental implementations of the certifications. Our work
opens the possibility of reusing the resource of an indefinite causal order
multiple times in device-independent quantum information processing.
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