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21 papers · 2 filters
Hybrid quantum device with a carbon nanotube and a flux qubit for dissipative quantum engineering
Xin Wang, Adam Miranowicz, Hong-Rong Li +1
We describe a hybrid quantum system composed of a micrometer-size carbon nanotube (CNT) longitudinally coupled to a flux qubit. We demonstrate the usefulness of this device for gen…
Direct method for measuring and witnessing quantum entanglement of arbitrary two-qubit states through Hong-Ou-Mandel interference
Karol Bartkiewicz, Grzegorz Chimczak, Karel Lemr
We describe a direct method for experimental determination of the negativity of an arbitrary two-qubit state with 11 measurements performed on multiple copies of the two-qubit syst…
Quantum correlations and entanglement in a model comprised of a short chain of nonlinear oscillators
J. K. Kalaga, A. Kowalewska-Kudłaszyk, W. Leoński +1
We discuss a model comprised of a chain of three Kerr-like nonlinear oscillators pumped by two modes of external coherent field. We show that the system can be treated as nonlinear…
Bell nonlocality and fully-entangled fraction measured in an entanglement-swapping device without quantum state tomography
Karol Bartkiewicz, Karel Lemr, Antonín Černoch +1
We demonstrate an efficient experimental procedure based on entanglement swapping to determine the Bell nonlocality measure of Horodecki et al. [Phys. Lett. A 200, 340 (1995)] and…
Fundamental Limitation on Cooling under Classical Noise
Jun Jing, Ravindra W. Chhajlany, Lian-Ao Wu
We prove a general theorem that the action of arbitrary classical noise or random unitary channels can not increase the maximum population of any eigenstate of an open quantum syst…
Spatio-Temporal Steering for Testing Nonclassical Correlations in Quantum Networks
Shin-Liang Chen, Neill Lambert, Che-Ming Li +4
We introduce the concept of spatio-temporal steering (STS), which reduces, in special cases, to Einstein-Podolsky-Rosen steering and the recently-introduced temporal steering. We d…