Steering Witness and Steering Criterion of Gaussian States [PDF]
Entropy, 2021 Quantum steering is an important quantum resource, which is intermediate between entanglement and Bell nonlocality. In this paper, we study steering witnesses for Gaussian states in continuous-variable systems.
Ruifen Ma +3 more
doaj +2 more sources
Nonclassicality by Local Gaussian Unitary Operations for Gaussian States [PDF]
Entropy, 2018 A measure of nonclassicality N in terms of local Gaussian unitary operations for bipartite Gaussian states is introduced. N is a faithful quantum correlation measure for Gaussian states as product states have no such correlation and every non
Yangyang Wang, Xiaofei Qi, Jinchuan Hou
doaj +2 more sources
Quantum Correlation Based on Uhlmann Fidelity for Gaussian States [PDF]
Entropy, 2018 A quantum correlation N F G , A for ( n + m ) -mode continuous-variable systems is introduced in terms of local Gaussian unitary operations performed on Subsystem A based on Uhlmann fidelity F.
Liang Liu, Jinchuan Hou, Xiaofei Qi
doaj +2 more sources
Symmetric Logarithmic Derivative of Fermionic Gaussian States [PDF]
Entropy, 2018 In this article, we derive a closed form expression for the symmetric logarithmic derivative of Fermionic Gaussian states. This provides a direct way of computing the quantum Fisher Information for Fermionic Gaussian states.
Angelo Carollo +2 more
doaj +2 more sources
Complexity of quantum tomography from genuine non-Gaussian entanglement [PDF]
Nature CommunicationsQuantum state tomography typically requires exponentially many copies of a quantum state, due to the complex correlations present in large systems.
Xiaobin Zhao +4 more
doaj +2 more sources
Bosonic Gaussian channel and Gaussian witness entanglement criterion of continuous variables
Physical Review Research, 2023 We use quantum entanglement witnesses derived from Gaussian operators to study the separable criteria of continuous variable states. For bipartite system, we transform the validity of a Gaussian witness to a bosonic Gaussian channel problem.
Xiao-yu Chen +3 more
doaj +1 more source
Fundamental limitations to key distillation from Gaussian states with Gaussian operations
Physical Review Research, 2023 We establish fundamental upper bounds on the amount of secret key that can be extracted from quantum Gaussian states by using local Gaussian operations, local classical processing, and public communication.
Ludovico Lami +2 more
doaj +1 more source
Non-Gaussian Quantum States and Where to Find Them
PRX Quantum, 2021 Gaussian states have played an important role in the physics of continuous-variable quantum systems. They are appealing for the experimental ease with which they can be produced, and for their compact and elegant mathematical description.
Mattia Walschaers
doaj +1 more source
Bosonic and fermionic Gaussian states from Kähler structures
SciPost Physics Core, 2021 We show that bosonic and fermionic Gaussian states (also known as "squeezed coherent states") can be uniquely characterized by their linear complex structure $J$ which is a linear map on the classical phase space.
Lucas Hackl, Eugenio Bianchi
doaj +1 more source
Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state [PDF]
Quantum, 2022 We present an algorithm to reliably generate various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing, such as Schrödinger cat states and Gottesman-Kitaev-Preskill (GKP) grid states, out of ...
Miller Eaton +4 more
doaj +1 more source