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6 papers · 2 filters
Quantum Chemistry in the Age of Quantum Computing
Yudong Cao, Jonathan Romero, Jonathan P. Olson +10
Practical challenges in simulating quantum systems on classical computers have been widely recognized in the quantum physics and quantum chemistry communities over the past century…
How to detect qubit-environment entanglement generated during qubit dephasing
Katarzyna Roszak, Damian Kwiatkowski, Łukasz Cywiński
We propose a straightforward experimental protocol to test whether qubit-environment entanglement is generated during pure dephasing of a qubit. The protocol is implemented using o…
Negativity volume of the generalized Wigner function as an entanglement witness for hybrid bipartite states
Ievgen I. Arkhipov, Artur Barasiński, Jiří Svozilík
In a recent paper, Tilma, Everitt {\it et al.} derived a generalized Wigner function that can characterize both the discrete and continuous variable states, i.e., hybrid states. As…
Experimental measurement of nonlinear entanglement witness by hyper-entangling two-qubit states
Vojtěch Trávníček, Karol Bartkiewicz, Antonín Černoch +1
We demonstrate that non-linear entanglement witnesses can be made particularly useful for entanglement detection in hyper-entangled or multilevel states. We test this idea experime…
Implementation of an efficient linear-optical quantum router
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
In this paper, we report on experimental implementation of a linear-optical quantum router. Our device allows single-photon polarization-encoded qubits to be routed coherently into…
Experimental tests of coherence and entanglement conservation
Antonín Černoch, Karol Bartkiewicz, Karel Lemr +1
We experimentally demonstrate the migration of coherence between composite quantum systems and their subsystems. The quantum systems are implemented using polarization states of ph…