400 citations · 849 across the 22 of their papers we have counts for
22 papers
Nine Lorentz covariant bitensors for two Dirac spinors to indicate all entangled states
Markus Johansson
The spinorial degrees of freedom of two spacelike separated Dirac particles are considered and a collection of nine locally Lorentz covariant bitensors is constructed. Four of thes…
Lorentz invariant polynomials as entanglement indicators for Dirac particles
Markus Johansson
The spinorial degrees of freedom of two or more spacelike separated Dirac particles are considered and a method for constructing mixed polynomials that are invariant under the spin…
Low degree Lorentz invariant polynomials as potential entanglement invariants for multiple Dirac spinors
Markus Johansson
A system of multiple spacelike separated Dirac particles is considered and a method for constructing polynomial invariants under the spinor representations of the local proper orth…
Candidate entanglement invariants for two Dirac spinors
Markus Johansson
We consider two spacelike separated Dirac particles and construct five invariants under the spinor representations of the local proper orthochronous Lorentz groups. All of the cons…
Equivalence between non-Markovian dynamics and correlation backflows
Dario De Santis, Markus Johansson
The information encoded into an open quantum system that evolves under a Markovian dynamics is always monotonically non-increasing. Nonetheless, for a given quantifier of the infor…
Witnessing non-Markovian dynamics through correlations
Dario De Santis, Markus Johansson, Bogna Bylicka +2
Non-Markovian effects in an open-system dynamics are usually associated to information backflows from the environment to the system. However, the way these backflows manifest and h…
A correlation measure detecting almost all non-Markovian evolutions
Dario De Santis, Markus Johansson, Bogna Bylicka +2
We investigate the ability of correlation measures to witness non-Markovian open quantum system dynamics. It is shown that the mutual information and any entanglement measure betwe…
Entangled systems are unbounded sources of nonlocal correlations and of certified random numbers
Florian J. Curchod, Markus Johansson, Remigiusz Augusiak +3
The outcomes of local measurements made on entangled systems can be certified to be random provided that the generated statistics violate a Bell inequality. This way of producing r…
Comment on 'Reasonable fermionic quantum information theories require relativity'
Markus Johansson
In [N. Friis, New J. Phys. 18, 033014 (2016)] the non-relativistic description of fermions is considered and in particular the role of the parity superselection rule in relation to…
Constructing entanglement measures for fermions
Markus Johansson, Zahra Raissi
In this paper we describe a method for finding polynomial invariants under Stochastic Local Operations and Classical Communication (SLOCC), for a system of delocalized fermions sha…
Constructive method for detecting the information backflow of bijective non-completely-positive-divisible dynamics
Bogna Bylicka, Markus Johansson, Antonio Acin
We investigate the relation between two approaches to the characterisation of quantum Markovianity, divisibility and lack of information backflow. We show that a bijective dynamica…
Unbounded randomness certification using sequences of measurements
F. J. Curchod, M. Johansson, R. Augusiak +3
Unpredictability, or randomness, of the outcomes of measurements made on an entangled state can be certified provided that the statistics violate a Bell inequality. In the standard…
Maximal entanglement of two delocalized spin- particles
Markus Johansson
We describe the entanglement of two indistinguishable delocalized spin- particles in the simplest spatial configuration of three spatial modes with the constraint that…
Local unitary symmetries and entanglement invariants
Markus Johansson
We investigate the relation between local unitary symmetries and entanglement invariants of multi-qubit systems. The Hilbert space of such systems can be stratified in terms of sta…
Classification scheme of pure multipartite states based on topological phases
Markus Johansson, Marie Ericsson, Erik Sjöqvist +1
We investigate the connection between the concept of affine balancedness (a-balancedness) introduced in [Phys. Rev A. {\bf 85}, 032112 (2012)] and polynomial local SU invariants an…
Three-qubit topological phase on entangled photon pairs
Markus Johansson, Antonio Z. Khoury, Kuldip Singh +1
We propose an experiment to observe the topological phases associated with cyclic evolutions, generated by local SU(2) operations, on three-qubit entangled states prepared on diffe…
Robustness of non-adiabatic holonomic gates
Markus Johansson, Erik Sjöqvist, L. Mauritz Andersson +4
The robustness to different sources of error of the scheme for non-adiabatic holonomic gates proposed in [New J. Phys. {\bf 14}, 103035 (2012)] is investigated. Open system effects…
Topological phases and multiqubit entanglement
Markus Johansson, Marie Ericsson, Kuldip Singh +2
Global phase factors of topological origin, resulting from cyclic local evolution, called topological phases, were first described in [Phys. Rev. Lett. {\bf 90}, 230403 (…
Non-adiabatic holonomic quantum computation
Erik Sjöqvist, D. M. Tong, L. Mauritz Andersson +3
We develop a non-adiabatic generalization of holonomic quantum computation in which high-speed universal quantum gates can be realized by using non-Abelian geometric phases. We sho…
Global asymmetry of many-qubit correlations: A lattice gauge theory approach
Mark S. Williamson, Marie Ericsson, Markus Johansson +3
We introduce a novel bridge between the familiar gauge field theory approaches used in many areas of modern physics such as quantum field theory and the SLOCC protocols familiar in…
Geometric local invariants and pure three-qubit states
Mark S. Williamson, Marie Ericsson, Markus Johansson +4
We explore a geometric approach to generating local SU(2) and invariants for a collection of qubits inspired by lattice gauge theory. Each local invariant or 'ga…
Correlation induced non-Abelian quantum holonomies
Markus Johansson, Marie Ericsson, Kuldip Singh +2
In the context of two-particle interferometry, we construct a parallel transport condition that is based on the maximization of coincidence intensity with respect to local unitary…