aqora

On sequential measurements with indefinite causal order

Masashi Ban

Physics Letters AApr 24, 202112 citations

Indefinite Causal Order

Jacquiline Romero, Kaumudikash Goswami, Christina Giarmatzi +4 more

Bulletin of the American Physical SocietyMar 7, 20190 citations

Measuring impossible parameters with indefinite causal order

Jaden McKinlay, Markus Rambach, Aaron Z. Goldberg +3 more

We demonstrate that a probe traversing a noisy channel and a measurement channel withstands arbitrarily more noise than any system with definite causal order, even if the probe is fully mixed and the noisy channel erases all information.

Jan 1, 20240 citations

Measuring the impossible by ignorance of events

Melvee George, William Gunn, Jaden McKinlay +5 more

In this talk I’ll introduce indefinite causal order— quantum superposition of ordering of events—and show you how it can be done with photons, the fundamental particle of light. We’ll then explore using this trick to communicate via perfectly noisy channels—which is classically impossible—and to measure rotations with completely noisy probes via a channel that erases all information—again, classically impossible. Questions before, during, and after the talk are highly encouraged.

Complex Light and Optical ForcesMar 5, 20260 citations

Thermal devices powered by generalized measurements with indefinite causal order

Pedro R. Dieguez, Vinicius F. Lisboa, Roberto M. Serra

A quantum-controlled device may produce a scenario in which two general quantum operations can be performed in such a way that it is not possible to associate a definite order for the operation's application. Such an indefinite causal order can be explored to produce nontrivial effects in quantum thermal devices. We investigate a measurement-powered thermal device that consists of generalized measurement channels with adjustable intensity parameters, where energy is exchanged with the apparatus in the form of work or heat. The measurement-based device can operate as a heat engine, a thermal accelerator, or a refrigerator, according to a measurement intensity setting. By employing a quantum switch of two measurement channels, we explore a thermal device fueled by an indefinite causal order. We also discuss how a coherent control over an indefinite causal order structure can change the operating regimes of the measurement-powered thermal device to produce an advantage when compared to a scenario with an incoherent control of the order switch.A quantum-controlled device may produce a scenario in which two general quantum operations can be performed in such a way that it is not possible to associate a definite order for the operation's application. Such an indefinite causal order can be explored to produce nontrivial effects in quantum thermal devices. We investigate a measurement-powered thermal device that consists of generalized measurement channels with adjustable intensity parameters, where energy is exchanged with the apparatus in the form of work or heat. The measurement-based device can operate as a heat engine, a thermal accelerator, or a refrigerator, according to a measurement intensity setting. By employing a quantum switch of two measurement channels, we explore a thermal device fueled by an indefinite causal order. We also discuss how a coherent control over an indefinite causal order structure can change the operating regimes of the measurement-powered thermal device to produce an advantage when compared to a scenario with an incoherent control of the order switch.

arXiv:2205.14406Physical Review AJan 23, 202334 citations

Indefinite causality

Yun Li

Nature PhysicsMay 1, 20170 citations

Measuring impossible parameters with indefinite causal order

Related papers

Measuring impossible parameters with indefinite causal order

Related papers