Causal classification of spatiotemporal quantum correlations
From correlations in measurement outcomes alone, can two otherwise isolated parties
establish whether such correlations are atemporal? That is, can they rule out that they have …
establish whether such correlations are atemporal? That is, can they rule out that they have …
Unification of spatiotemporal quantum formalisms: mapping between process and pseudo-density matrices via multiple-time states
We consider the relation between three different approaches to defining quantum states
across several times and locations: the pseudo-density matrix (PDM), the process matrix …
across several times and locations: the pseudo-density matrix (PDM), the process matrix …
Quantum space-time marginal problem: global causal structure from local causal information
Z Jia, M Song, D Kaszlikowski - New Journal of Physics, 2023 - iopscience.iop.org
Spatial and temporal quantum correlations can be unified in the framework of the pseudo-
density operators (PDOs), and quantum causality between the involved events in an …
density operators (PDOs), and quantum causality between the involved events in an …
Quantum dynamics as a pseudo-density matrix
J Fullwood - arXiv preprint arXiv:2304.03954, 2023 - arxiv.org
While in relativity theory space evolves over time into a single entity known as spacetime,
quantum theory lacks a standard notion of how to encapsulate the dynamical evolution of a …
quantum theory lacks a standard notion of how to encapsulate the dynamical evolution of a …
Time-symmetric correlations for open quantum systems
AJ Parzygnat, J Fullwood - arXiv preprint arXiv:2407.11123, 2024 - arxiv.org
Two-time expectation values of sequential measurements of dichotomic observables are
known to be time symmetric for closed quantum systems. Namely, if a system evolves …
known to be time symmetric for closed quantum systems. Namely, if a system evolves …
Quantum causal inference with extremely light touch
We consider the quantum version of inferring the causal relation between events. There has
been recent progress towards identifying minimal interventions and observations needed …
been recent progress towards identifying minimal interventions and observations needed …
Certifying Quantum Temporal Correlation via Randomized Measurements: Theory and Experiment
We consider the certification of temporal quantum correlations using the pseudo-density
matrix (PDM), an extension of the density matrix to the time domain, where negative …
matrix (PDM), an extension of the density matrix to the time domain, where negative …
General covariance for quantum states over time
J Fullwood - Letters in Mathematical Physics, 2024 - Springer
Quantum states over time are a spatiotemporal generalization of density operators which
were first introduced to give a more even-handed treatment of space and time in quantum …
were first introduced to give a more even-handed treatment of space and time in quantum …
Quantum Mutual Information in Time
While the quantum mutual information is a fundamental measure of quantum information, it
is only defined for spacelike-separated quantum systems. Such a limitation is not present in …
is only defined for spacelike-separated quantum systems. Such a limitation is not present in …
Certifying temporal correlations
Self-testing has been established as a major approach for quantum device certification
based on experimental statistics with minimal assumptions. However, despite more than 20 …
based on experimental statistics with minimal assumptions. However, despite more than 20 …