Difference between revisions of "Arxiv Selection Oct 2020"
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Considering the thermodynamics of bosons in a lattice described by the Bose-Hubbard Hamiltonian, we report the occurrence of anomalous double peaks in their specific heat dependence on tempera- ture. This feature, usually associated with a high geometrical frustration, can also be a consequence of a purely energetic competition. By employing self-energy functional calculations combined with finite-temperature perturbation theory, we propose a mechanism based on ground-state degeneracies expressed as residual entropies. A general decomposition of the specific heat regarding all possible transitions between the system’s eingenvalues provides an insight into the nature of each maximum. Furthermore, we address how the model parameters modify the structure of these peaks based on its spectral properties and atom-atom correlation function. | Considering the thermodynamics of bosons in a lattice described by the Bose-Hubbard Hamiltonian, we report the occurrence of anomalous double peaks in their specific heat dependence on tempera- ture. This feature, usually associated with a high geometrical frustration, can also be a consequence of a purely energetic competition. By employing self-energy functional calculations combined with finite-temperature perturbation theory, we propose a mechanism based on ground-state degeneracies expressed as residual entropies. A general decomposition of the specific heat regarding all possible transitions between the system’s eingenvalues provides an insight into the nature of each maximum. Furthermore, we address how the model parameters modify the structure of these peaks based on its spectral properties and atom-atom correlation function. | ||
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+ | ==Oct 11== | ||
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+ | arXiv:2010.05159 [pdf, ps, other] gr-qc hep-th quant-ph | ||
+ | |||
+ | Entanglement and decoherence of massive particles due to gravity | ||
+ | |||
+ | Authors: Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto | ||
+ | |||
+ | Abstract: We analyze the dynamics of gravity-induced entanglement for N massive particles. Considering a linear configuration of these particles, we investigate the entanglement between a specific pair of particles under the influence of the gravitational interaction between the massive particles. As the particle number increases, the specific particle pair decoheres more easily due to the gravitational int… ▽ More | ||
+ | Submitted 15 October, 2020; v1 submitted 11 October, 2020; originally announced October 2020. | ||
+ | Comments: 20 pages, 5 figures | ||
+ | |||
+ | |||
+ | ==Oct 09== | ||
+ | |||
+ | arXiv:2010.04443 [pdf, other] quant-ph cond-mat.mes-hall cond-mat.stat-mech | ||
+ | |||
+ | Ring-Frustrated Non-Hermitian XY Model | ||
+ | |||
+ | Authors: Shihao Bi, Yan He, Peng Li | ||
+ | |||
+ | Abstract: We study a non-Hermitian version of XY closed chain with odd number of lattice sites. We consider both anti-ferromagnetic coupling and also a symmetric non-collinear spin coupling. It is found that the energy spectrum is real in certain region of the parameter space. In contrast to previous non-Hermitian models, the ground state is a state with one mode occupied inside this real energy spectrum re… ▽ More | ||
+ | Submitted 9 October, 2020; originally announced October 2020. | ||
+ | Comments: 5 pages, 5 figures | ||
Latest revision as of 13:41, 20 October 2020
Oct 1- Oct 7 Bhaskar Mukherjee, Oct 8- Oct 14 Zehan Li, Oct 15- Oct 21 Haiping Hu, Oct 22- Oct 28 Sayan Choudhury
Oct 14
arXiv:2010.06560 [pdf, other]
Double-peak specific heat anomaly and correlations in the Bose-Hubbard model
Eduardo O. Rizzatti, Marco Aurélio A. Barbosa, Marcia C. Barbosa
Subjects: Quantum Gases (cond-mat.quant-gas)
Considering the thermodynamics of bosons in a lattice described by the Bose-Hubbard Hamiltonian, we report the occurrence of anomalous double peaks in their specific heat dependence on tempera- ture. This feature, usually associated with a high geometrical frustration, can also be a consequence of a purely energetic competition. By employing self-energy functional calculations combined with finite-temperature perturbation theory, we propose a mechanism based on ground-state degeneracies expressed as residual entropies. A general decomposition of the specific heat regarding all possible transitions between the system’s eingenvalues provides an insight into the nature of each maximum. Furthermore, we address how the model parameters modify the structure of these peaks based on its spectral properties and atom-atom correlation function.
Oct 11
arXiv:2010.05159 [pdf, ps, other] gr-qc hep-th quant-ph
Entanglement and decoherence of massive particles due to gravity
Authors: Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto
Abstract: We analyze the dynamics of gravity-induced entanglement for N massive particles. Considering a linear configuration of these particles, we investigate the entanglement between a specific pair of particles under the influence of the gravitational interaction between the massive particles. As the particle number increases, the specific particle pair decoheres more easily due to the gravitational int… ▽ More Submitted 15 October, 2020; v1 submitted 11 October, 2020; originally announced October 2020. Comments: 20 pages, 5 figures
Oct 09
arXiv:2010.04443 [pdf, other] quant-ph cond-mat.mes-hall cond-mat.stat-mech
Ring-Frustrated Non-Hermitian XY Model
Authors: Shihao Bi, Yan He, Peng Li
Abstract: We study a non-Hermitian version of XY closed chain with odd number of lattice sites. We consider both anti-ferromagnetic coupling and also a symmetric non-collinear spin coupling. It is found that the energy spectrum is real in certain region of the parameter space. In contrast to previous non-Hermitian models, the ground state is a state with one mode occupied inside this real energy spectrum re… ▽ More Submitted 9 October, 2020; originally announced October 2020. Comments: 5 pages, 5 figures
Oct 08
arXiv:2010.03841 [pdf, ps, other] quant-ph
Efficient unstructured search implementation on current ion-trap quantum processors
Authors: Vladyslav Hlembotskyi, Rafał Burczyński, Witold Jarnicki, Adam Szady, Jan Tułowiecki
Abstract: So far, only the results on 3 qubit spaces (both on superconducting and ion-trap realisations of quantum processors) have beaten the classical unstructured search in the expected number of oracle calls using optimal protocols in both settings. We present experimental results on running unstructured search in spaces defined by 4, 5 and 6 qubits on ion-trapped quantum processor. Our best circuits ob… ▽ More Submitted 8 October, 2020; originally announced October 2020. Comments: 10 pages, 14 figures Report number: 20-10-H