Permutation invariance in quantum processes

2020 ◽  
Author(s):  
◽  
Lachlan Parker
Keyword(s):  
Quantum Processes ◽  
Permutation Invariance

Picturing Quantum Processes

2017 ◽  
Author(s):  
Bob Coecke ◽  
Aleks Kissinger
Keyword(s):  
Quantum Processes

Double excitation of Nd3+ pairs in LaF3 by two step and double quantum processes

1984 ◽  
Vol 45 (9) ◽  
pp. 1533-1541 ◽  
Author(s):  
R. Buisson ◽  
J.Q. Liu ◽  
J.C. Vial
Keyword(s):  
Double Quantum ◽  
Quantum Processes ◽  
Double Excitation

scholarly journals Generalized theory of pseudomodes for exact descriptions of non-Markovian quantum processes

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Graeme Pleasance ◽  
Barry M. Garraway ◽  
Francesco Petruccione
Keyword(s):  
Quantum Processes

scholarly journals Efficient Classical Simulation and Benchmarking of Quantum Processes in the Weyl Basis

2021 ◽  
Vol 126 (21) ◽  
Author(s):  
Daniel Stilck França ◽  
Sergii Strelchuk ◽  
Michał Studziński
Keyword(s):  
Quantum Processes ◽  
Classical Simulation ◽  
Weyl Basis

scholarly journals Cyclic quantum causal models

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonathan Barrett ◽  
Robin Lorenz ◽  
Ognyan Oreshkov
Keyword(s):  
Causal Reasoning ◽  
Causal Structure ◽  
Bell Inequalities ◽  
Quantum Correlations ◽  
Quantum Systems ◽  
Causal Models ◽  
Causal Order ◽  
Quantum Processes ◽  
Causal Explanations ◽  
Causal Structures

AbstractCausal reasoning is essential to science, yet quantum theory challenges it. Quantum correlations violating Bell inequalities defy satisfactory causal explanations within the framework of classical causal models. What is more, a theory encompassing quantum systems and gravity is expected to allow causally nonseparable processes featuring operations in indefinite causal order, defying that events be causally ordered at all. The first challenge has been addressed through the recent development of intrinsically quantum causal models, allowing causal explanations of quantum processes – provided they admit a definite causal order, i.e. have an acyclic causal structure. This work addresses causally nonseparable processes and offers a causal perspective on them through extending quantum causal models to cyclic causal structures. Among other applications of the approach, it is shown that all unitarily extendible bipartite processes are causally separable and that for unitary processes, causal nonseparability and cyclicity of their causal structure are equivalent.

scholarly journals Thermodynamics of discrete quantum processes

2013 ◽  
Vol 15 (3) ◽  
pp. 033022 ◽  
Author(s):  
Janet Anders ◽  
Vittorio Giovannetti
Keyword(s):  
Quantum Processes

Optimal two-particle entanglement by universal quantum processes

2001 ◽  
Vol 1 (3) ◽  
pp. 33-51
Author(s):  
G Alber ◽  
A Delgado ◽  
I Jex
Keyword(s):  
Hilbert Spaces ◽  
Parameter Family ◽  
Entanglement Measure ◽  
Input State ◽  
Quantum Processes ◽  
Single Exception ◽  
Universal Quantum

Within the class of all possible universal (covariant) two-particle quantum processes in arbitrary dimensional Hilbert spaces those universal quantum processes are determined whose output states optimize the recently proposed entanglement measure of Vidal and Werner. It is demonstrated that these optimal entanglement processes belong to a one-parameter family of universal entanglement processes whose output states do not contain any separable components. It is shown that these optimal universal entanglement processes generate antisymmetric output states and, with the single exception of qubit systems, they preserve information about the initial input state.

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