736 citations · 3.5k across the 116 of their papers we have counts for
7 papers · 2 filters
Secure communication with a publicly known key
Almut Beige, Berthold-Georg Englert, Christian Kurtsiefer +1
We present a scheme for direct and confidential communication between Alice and Bob, where there is no need for establishing a shared secret key first, and where the key used by Al…
Measuring irreversible dynamics of a quantum harmonic oscillator
Giovanna Morigi, Enrique Solano, Berthold-Georg Englert +1
We show that the unitary evolution of a harmonic oscillator coupled to a two-level system can be undone by a suitable manipulation of the two-level system -- more specifically: by…
Separability of Two-Party Gaussian States
Berthold-Georg Englert, Krzysztof Wodkiewicz
We investigate the separability properties of quantum two-party Gaussian states in the framework of the operator formalism for the density operator. Such states arise as natural ge…
The mean king's problem: Spin 1
Yakir Aharonov, Berthold-Georg Englert
We show how one can ascertain the values of four mutually complementary observables of a spin-1 degree of freedom.
Universal unitary gate for single-photon 2-qubit states
Berthold-Georg Englert, Christian Kurtsiefer, Harald Weinfurter
Upon entangling a spatial binary alternative of a photon with its polarization, one can use single photons to study arbitrary 2-qubit states. Sending the photon through a Mach-Zehn…
The mean king's problem: Prime degrees of freedom
Berthold-Georg Englert, Yakir Aharonov
We show how one can ascertain the values of a complete set of mutually complementary observables of a prime degree of freedom.