4,801 research outputs found
Beyond Gisin's Theorem and its Applications: Violation of Local Realism by Two-Party Einstein-Podolsky-Rosen Steering
We demonstrate here that for a given mixed multi-qubit state if there are at
least two observers for whom mutual Einstein-Podolsky-Rosen steering is
possible, i.e. each observer is able to steer the other qubits into two
different pure states by spontaneous collapses due to von Neumann type
measurements on his/her qubit, then nonexistence of local realistic models is
fully equivalent to quantum entanglement (this is not so without this
condition). This result leads to an enhanced version of Gisin's theorem
(originally: all pure entangled states violate local realism). Local realism is
violated by all mixed states with the above steering property. The new class of
states allows one e.g. to perform three party secret sharing with just pairs of
entangled qubits, instead of three qubit entanglements (which are currently
available with low fidelity). This significantly increases the feasibility of
having high performance versions of such protocols. Finally, we discuss some
possible applications.Comment: 9 pages, 1 figur
Quetiapine N-oxide–fumaric acid (2/1)
The title compound (systematic name: 2-{2-[4-(dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl 1-oxide]ethoxy}ethanol–fumaric acid (2/1)), C21H25N3O3S·0.5C4H4O4, is one of the oxidation products of quetiapine hemifumaric acid. In the tricyclic fragment, the central thiazepine ring displays a boat conformation and the benzene rings are inclined to each other at a dihedral angle of 72.0 (2)°. The piperazine ring adopts a chair conformation with its ethoxyethanol side chain oriented equatorially. In addition to the main molecule, the asymmetric unit contains one-half molecule of fumaric acid, the complete molecule being generated by inversion symmetry. In the crystal, O—H⋯O hydrogen bonds link the components into corrugated layers parallel to bc plane
Content-Dependent Fine-Grained Speaker Embedding for Zero-Shot Speaker Adaptation in Text-to-Speech Synthesis
Zero-shot speaker adaptation aims to clone an unseen speaker's voice without
any adaptation time and parameters. Previous researches usually use a speaker
encoder to extract a global fixed speaker embedding from reference speech, and
several attempts have tried variable-length speaker embedding. However, they
neglect to transfer the personal pronunciation characteristics related to
phoneme content, leading to poor speaker similarity in terms of detailed
speaking styles and pronunciation habits. To improve the ability of the speaker
encoder to model personal pronunciation characteristics, we propose
content-dependent fine-grained speaker embedding for zero-shot speaker
adaptation. The corresponding local content embeddings and speaker embeddings
are extracted from a reference speech, respectively. Instead of modeling the
temporal relations, a reference attention module is introduced to model the
content relevance between the reference speech and the input text, and to
generate the fine-grained speaker embedding for each phoneme encoder output.
The experimental results show that our proposed method can improve speaker
similarity of synthesized speeches, especially for unseen speakers.Comment: Submitted to Interspeech 202
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