Experimental aspects of indefinite causal order in quantum mechanics

LA Rozema, T Strömberg, H Cao, Y Guo, BH Liu… - Nature Reviews …, 2024‏ - nature.com
In the past decade, the toolkit of quantum information has been expanded to include
processes in which the basic operations do not have definite causal relations. Originally …

Charging quantum batteries via indefinite causal order: Theory and experiment

G Zhu, Y Chen, Y Hasegawa, P Xue - Physical review letters, 2023‏ - APS
In the standard quantum theory, the causal order of occurrence between events is
prescribed, and must be definite. This has been maintained in all conventional scenarios of …

[HTML][HTML] Exploring quantum thermodynamics with NMR

CHS Vieira, JLD de Oliveira, JFG Santos… - Journal of Magnetic …, 2023‏ - Elsevier
Quantum thermodynamics seeks to extend non-equilibrium stochastic thermodynamics to
small quantum systems where non-classical features are essential to its description. Such a …

Experimental validation of enhanced information capacity by quantum switch in accordance with thermodynamic laws

C **, X Liu, H Liu, K Huang, X Long, D Ebler, X Nie… - Physical Review Letters, 2024‏ - APS
We experimentally probe the interplay of the quantum switch with the laws of
thermodynamics. The quantum switch places two channels in a superposition of orders and …

Device-independent certification of indefinite causal order in the quantum switch

T Van Der Lugt, J Barrett, G Chiribella - Nature Communications, 2023‏ - nature.com
Quantum theory is compatible with scenarios in which the order of operations is indefinite.
Experimental investigations of such scenarios, all of which have been based on a process …

Thermal devices powered by generalized measurements with indefinite causal order

PR Dieguez, VF Lisboa, RM Serra - Physical Review A, 2023‏ - APS
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 …

Quantum switch instabilities with an open control

OAD Molitor, AHA Malavazi, RD Baldijão… - Communications …, 2024‏ - nature.com
The superposition of causal orders shows promise in various quantum technologies.
However, the fragility of quantum systems arising from environmental interactions, leading to …

Role of quantum correlations in daemonic expected utility

G Francica, L Dell'Anna - Physical Review A, 2024‏ - APS
Fluctuations can challenge the possibility of improving work extraction from quantum
correlations. This uncertainty in the work extraction process can be addressed by resorting …

Quantum operations with indefinite time direction

G Chiribella, Z Liu - Communications Physics, 2022‏ - nature.com
The fundamental dynamics of quantum particles is neutral with respect to the arrow of time.
And yet, our experiments are not: we observe quantum systems evolving from the past to the …

Evading noise in multiparameter quantum metrology with indefinite causal order

AZ Goldberg, K Heshami, LL Sánchez-Soto - Physical Review Research, 2023‏ - APS
Quantum theory allows the traversing of multiple channels in a superposition of different
orders. When the order in which the channels are traversed is controlled by an auxiliary …