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Observation of one-way Einstein-Podolsky-Rosen steering
Vitus Händchen, Tobias Eberle, Sebastian Steinlechner +4
The distinctive non-classical features of quantum physics were first discussed in the seminal paper by A. Einstein, B. Podolsky and N. Rosen (EPR) in 1935. In his immediate respons…
Quantum Walks with Non-Orthogonal Position States
R. Matjeschk, A. Ahlbrecht, M. Enderlein +5
Quantum walks have by now been realized in a large variety of different physical settings. In some of these, particularly with trapped ions, the walk is implemented in phase space,…
How long can it take for a quantum channel to forget everything?
Andre Ahlbrecht, Florian Richter, Reinhard F. Werner
We investigate quantum channels, which after a finite number of repeated applications erase all input information, i.e., channels whose -th power (but no smaller power) is a…
Characterization of informational completeness for covariant phase space observables
Jukka Kiukas, Pekka Lahti, Jussi Schultz +1
A covariant phase space observable is uniquely characterized by a positive operator of trace one and, in turn, by the Fourier-Weyl transform of this operator. We study three proper…
Recurrence for discrete time unitary evolutions
F. A. Grünbaum, L. Velázquez, A. H. Werner +1
We consider quantum dynamical systems specified by a unitary operator U and an initial state vector ϕ. In each step the unitary is followed by a projective measurement checking whe…
Asymptotic behavior of quantum walks with spatio-temporal coin fluctuations
Andre Ahlbrecht, Christopher Cedzich, Robert Matjeschk +3
Quantum walks subject to decoherence generically suffer the loss of their genuine quantum feature, a quadratically faster spreading compared to classical random walks. This intuiti…