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quant-ph2024
Quantum state tomography on closed timelike curves using weak measurements
Lachlan G. Bishop, Fabio Costa, Timothy C. Ralph
Any given prescription of quantum time travel necessarily endows a Hilbert space to the chronology-violating (CV) system on the closed timelike curve (CTC). However, under the two…
quant-ph2024★ 1 cited
Measuring two temperatures using a single thermometer
Harshit Verma, Fabio Costa
We consider the question: Is it possible to measure two temperatures simultaneously using a single thermometer? Under common circumstances, where the thermometer can interact with…
quant-ph2024★ 1 cited
A de Finetti theorem for quantum causal structures
Fabio Costa, Jonathan Barrett, Sally Shrapnel
What does it mean for a causal structure to be `unknown'? Can we even talk about `repetitions' of an experiment without prior knowledge of causal relations? And under what conditio…