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1 Ferromagnetic Resonance with Magnetic Phase Selectivity by Means of Resonant Elastic X-Ray Scattering on a Chiral Magnet 2019-10-15             

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Author(s): S. Pöllath, A. Aqeel, A. Bauer, C. Luo, H. Ryll, F. Radu, C. Pfleiderer, G. Woltersdorf, and C. H. Back

Ferromagnetic resonance experiments performed in reciprocal space allow unambiguous identification of magnetic modes in complex magnetic systems.


[Phys. Rev. Lett. 123, 167201] Published Mon Oct 14, 2019

2 Breakup and Recovery of Topological Zero Modes in Finite Non-Hermitian Optical Lattices 2019-10-15             

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Author(s): Wange Song, Wenzhao Sun, Chen Chen, Qinghai Song, Shumin Xiao, Shining Zhu, and Tao Li

The introduction of non-Hermitian degeneracy through loss modulation in silicon waveguides makes it possible to observe the recovery of the exact-zero mode of optical topological edge states.


[Phys. Rev. Lett. 123, 165701] Published Mon Oct 14, 2019

3 Entanglement Swapping with Photons Generated on Demand by a Quantum Dot 2019-10-15             

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Author(s): F. Basso Basset, M. B. Rota, C. Schimpf, D. Tedeschi, K. D. Zeuner, S. F. Covre da Silva, M. Reindl, V. Zwiller, K. D. Jöns, A. Rastelli, and R. Trotta

Photonic entanglement swapping, the procedure of entangling photons without any direct interaction, is a fundamental test of quantum mechanics and an essential resource to the realization of quantum networks. Probabilistic sources of nonclassical light were used for seminal demonstration of entangle...


[Phys. Rev. Lett. 123, 160501] Published Mon Oct 14, 2019

4 Entanglement Swapping with Semiconductor-Generated Photons Violates Bell’s Inequality 2019-10-15             

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Author(s): Michael Zopf, Robert Keil, Yan Chen, Jingzhong Yang, Disheng Chen, Fei Ding, and Oliver G. Schmidt

Transferring entangled states between photon pairs is essential in quantum communication. Semiconductor quantum dots are the leading candidate for generating polarization-entangled photons deterministically. Here we show for the first time swapping of entangled states between two pairs of photons em...


[Phys. Rev. Lett. 123, 160502] Published Mon Oct 14, 2019

5 Highly Charged Droplets of Superfluid Helium 2019-10-15             

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Author(s): Felix Laimer, Lorenz Kranabetter, Lukas Tiefenthaler, Simon Albertini, Fabio Zappa, Andrew M. Ellis, Michael Gatchell, and Paul Scheier

Tiny droplets of superfluid helium can contain more than fifty charges, which could act as nucleation sites for growing nanostructures.


[Phys. Rev. Lett. 123, 165301] Published Mon Oct 14, 2019

6 Observing and Verifying the Quantum Trajectory of a Mechanical Resonator 2019-10-15             

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Author(s): Massimiliano Rossi, David Mason, Junxin Chen, and Albert Schliesser

Continuous weak measurement allows localizing open quantum systems in state space and tracing out their quantum trajectory as they evolve in time. Efficient quantum measurement schemes have previously enabled recording quantum trajectories of microwave photon and qubit states. We apply these concept...


[Phys. Rev. Lett. 123, 163601] Published Mon Oct 14, 2019

7 Construction and Universal Application of Entanglement-Erasing Partner States 2019-10-15             

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Author(s): Daniel Hetterich and Polina Matveeva

We investigate the subadditivity of the bipartite entanglement entropy (EE) of many-particle states, represented by Slater determinants, with respect to single particle excitations. In this setting, subadditivity can be phrased as erasure of EE, i.e., as a relative decrease in EE when adding excitat...


[Phys. Rev. Lett. 123, 160503] Published Mon Oct 14, 2019

8 Anomaly of the Electromagnetic Duality of Maxwell Theory 2019-10-15             

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Author(s): Chang-Tse Hsieh, Yuji Tachikawa, and Kazuya Yonekura

The well known electric-magnetic duality of classical electromagnetism is violated upon quantization of the theory in the presence of general background fields.


[Phys. Rev. Lett. 123, 161601] Published Mon Oct 14, 2019

9 Accessing the bath information in open quantum systems with the stochastic $c$-number Langevin equation method 2019-10-15             

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Author(s): Zheng-Yang Zhou, Yun-An Yan, Stephen Hughes, J. Q. You, and Franco Nori

In traditional open quantum systems, the baths are usually traced out so that only the system information is left in the equations of motion. However, recent studies reveal that using only the system degrees of freedom can be insufficient. In this work, we develop a stochastic $c$-number Langevin eq...


[Phys. Rev. A 100, 042112] Published Mon Oct 14, 2019

10 Nonlocality, quantum correlations, and violations of classical realism in the dynamics of two noninteracting quantum walkers 2019-10-15             

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Author(s): Alexandre C. Orthey, Jr. and R. M. Angelo

That quantum correlations can be generated over time between the spin and the position of a quantum walker is indisputable. The creation of bipartite entanglement has also been reported for two-walker systems. In this scenario, however, since the global state lies in a fourpartite Hilbert space, the...


[Phys. Rev. A 100, 042110] Published Mon Oct 14, 2019

 
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