869 citations · 10.9k across the 170 of their papers we have counts for
10 papers · 2 filters
Infinite qubit rings with maximal nearest neighbor entanglement: the Bethe ansatz solution
U. V. Poulsen, T. Meyer, D. Bruss +1
We search for translationally invariant states of qubits on a ring that maximize the nearest neighbor entanglement. This problem was initially studied by O'Connor and Wootters [Phy…
Capacities of noiseless quantum channels for massive indistinguishable particles: Bosons vs. fermions
Aditi Sen De, Ujjwal Sen, Bartosz Gromek +2
We consider information transmission through a noiseless quantum channel, where the information is encoded into massive indistinguishable particles: bosons or fermions. We study th…
Physical Purification of Quantum States
M. Kleinmann, H. Kampermann, T. Meyer +1
We introduce the concept of a physical process that purifies a mixed quantum state, taken from a set of states, and investigate the conditions under which such a purification map e…
Dense coding with multipartite quantum states
Dagmar Bruss, Giacomo Mauro D'Ariano, Maciej Lewenstein +3
We consider generalisations of the dense coding protocol with an arbitrary number of senders and either one or two receivers, sharing a multiparty quantum state, and using a noisel…
Differential atom interferometry beyond the standard quantum limit
K. Eckert, P. Hyllus, D. Bruss +6
We analyze methods to go beyond the standard quantum limit for a class of atomic interferometers, where the quantity of interest is the difference of phase shifts obtained by two i…
Quantum estimation of relative information
Netanel H. Lindner, Petra F. Scudo, Dagmar Bruss
We derive optimal schemes for preparation and estimation of relational degrees of freedom between two quantum systems. We specifically analyze the case of rotation parameters repre…
Capacities of Quantum Channels for Massive Bosons and Fermions
Aditi Sen De, Ujjwal Sen, Bartosz Gromek +2
We consider the capacity of classical information transfer for noiseless quantum channels carrying a finite average number of massive bosons and fermions. The maximum capacity is a…
Relations between Entanglement Witnesses and Bell Inequalities
P. Hyllus, O. Guehne, D. Bruss +1
Bell inequalities, considered within quantum mechanics, can be regarded as non-optimal witness operators. We discuss the relationship between such Bell witnesses and general entang…
On the generalization of quantum state comparison
M. Kleinmann, H. Kampermann, D. Bruss
We investigate the unambiguous comparison of quantum states in a scenario that is more general than the one that was originally suggested by Barnett et al. First, we find the optim…
Usefulness of classical communication for local cloning of entangled states
Rafal Demkowicz-Dobrzanski, Maciej Lewenstein, Aditi Sen De +2
We solve the problem of the optimal cloning of pure entangled two-qubit states with a fixed degree of entanglement using local operations and classical communication. We show, that…