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Quantum correlations with no causal order
The idea that events obey a definite causal order is deeply rooted in our understanding of the world and at the basis of the very notion of time. But where does causal order come from, and is it a… Expand
Causal and causally separable processes
The idea that events are equipped with a partial causal order is central to our understanding of physics in the tested regimes: given two pointlike events A and B, either A is in the causal past of… Expand
General conditions for approximate quantum error correction and near-optimal recovery channels.
We derive necessary and sufficient conditions for the approximate correctability of a quantum code, generalizing the Knill-Laflamme conditions for exact error correction. Our measure of success of… Expand
Weak measurements are universal.
It is well known that any projective measurement can be decomposed into a sequence of weak measurements, which cause only small changes to the state. Similar constructions for generalized… Expand
Optimal signal states for quantum detectors
Quantum detectors provide information about the microscopic properties of quantum systems by establishing correlations between those properties and a set of macroscopically distinct events that we… Expand
Adiabatic markovian dynamics.
We propose a theory of adiabaticity in quantum markovian dynamics based on a decomposition of the Hilbert space induced by the asymptotic behavior of the Lindblad semigroup. A central idea of our… Expand
Operational quantum theory without predefined time
The standard formulation of quantum theory assumes a predefined notion of time. This is a major obstacle in the search for a quantum theory of gravity, where the causal structure of space-time is… Expand
On the whereabouts of the local operations in physical realizations of quantum processes with indefinite causal order
- Ognyan Oreshkov
- 23 January 2018
It was recently found that it is theoretically possible for there to exist quantum processes in which the order of the operations performed by separate parties cannot be ascribed a definite causal… Expand
Non-Markovian dynamics of a qubit coupled to an Ising spin bath
We study the analytically solvable Ising model of a single qubit system coupled to a spin bath. The purpose of this study is to analyze and elucidate the performance of Markovian and non-Markovian… Expand
Operational formulation of time reversal in quantum theory
The symmetry of quantum theory under time reversal has long been a subject of controversy because the transition probabilities given by Born’s rule do not apply backward in time. Here, we resolve… Expand