Quanta Pub Date : 2021-10-13 DOI: 10.22460/Q.V5I3P106-110.2816

Endah Andriani Pratiwi, Devy Sekar ayu Ningrum

引用次数: 0

HUBUNGAN ANTARA HARGA DIRI DENGAN PERILAKU ASERTIF PADA REMAJA 世界的贡献是当我有一个真正的自信

Quanta Pub Date : 2021-10-13 DOI: 10.22460/Q.V5I3P95-105.2815

Wiki Aryanto, Cucu Arumsari, Dewang Sulistiana

引用次数: 1

Jordan in The Church of The Higher Hilbert Space: Entanglement and Thermal Fluctuations 乔丹在高等希尔伯特空间的教堂:纠缠和热涨落

Quanta Pub Date : 2021-10-12 DOI: 10.12743/quanta.v11i1.180

V. Vedral

{"title":"Jordan in The Church of The Higher Hilbert Space: Entanglement and Thermal Fluctuations","authors":"V. Vedral","doi":"10.12743/quanta.v11i1.180","DOIUrl":"https://doi.org/10.12743/quanta.v11i1.180","url":null,"abstract":"I revisit Jordan's derivation of Einstein's formula for energy fluctuations in the black body in thermal equilibrium. This formula is usually taken to represent the unification of the wave and the particle aspects of the electromagnetic field since the fluctuations can be shown to be the sum of wave-like and particle-like contributions. However, in Jordan's treatment there is no mention of the Planck distribution and all averages are performed with respect to pure number states of radiation (mixed states had not yet been discovered!). The chief reason why Jordan does reproduce Einstein's result despite not using thermal states of radiation is that he focuses on fluctuations in a small (compared to the whole) volume of the black body. The state of radiation in a small volume is highly entangled to the rest of the black body which leads to the correct fluctuations even though the overall state might, in fact, be assumed to be pure (i.e. at zero temperature). I present a simple derivation of the fluctuations formula as an instance of mixed states being reductions of higher level pure states, a representation that is affectionately known as \"Church of the Higher Hilbert Space\". According to this view of mixed states, temperature is nothing but the amount of entanglement between the system and its environment.Quanta 2022; 11: 1–4.","PeriodicalId":37613,"journal":{"name":"Quanta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45228720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Steady State in Ultrastrong Coupling Regime: Expansion and First Orders 超强耦合中的稳态:展开和一阶

Quanta Pub Date : 2021-10-05 DOI: 10.12743/quanta.v11i1.167

C. L. Latune

{"title":"Steady State in Ultrastrong Coupling Regime: Expansion and First Orders","authors":"C. L. Latune","doi":"10.12743/quanta.v11i1.167","DOIUrl":"https://doi.org/10.12743/quanta.v11i1.167","url":null,"abstract":"Understanding better the dynamics and steady states of systems strongly coupled to thermal baths is a great theoretical challenge with promising applications in several fields of quantum technologies. Among several strategies to gain access to the steady state, one consists in obtaining approximate expressions of the mean force Gibbs state, the reduced state of the global system-bath thermal state, largely credited to be the steady state. Here, we present analytical expressions of corrective terms to the ultrastrong coupling limit of the mean force Gibbs state, which has been recently derived. We find that the first order term precisely coincides with the first order correction obtained from a dynamical approach—master equation in the strong-decoherence regime. This strengthens the identification of the reduced steady state with the mean force Gibbs state. Additionally, we also compare our expressions with another recent result obtained from a high temperature expansion of the mean force Gibbs state. We observe numerically a good agreement for ultra strong coupling as well as for high temperatures. This confirms the validity of all these results. In particular, we show that, in term of coherences, all three results allow one to sketch the transition from ultrastrong coupling to weak coupling.Quanta 2022; 11: 53–71.","PeriodicalId":37613,"journal":{"name":"Quanta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44356992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Canonical structure of A and B maps A和B映射的正则结构

Quanta Pub Date : 2021-09-21 DOI: 10.12743/quanta.v10i1.165

Sudha, B.N.Karthik, A. Devi, A.K.Rajagopal

引用次数: 1

Revisiting the Quantum Open System Dynamics of Central Spin Model 重访中心自旋模型的量子开放系统动力学

Quanta Pub Date : 2021-09-13 DOI: 10.12743/quanta.v10i1.162

S. Bhattacharya, Subhashis Banerjee

引用次数: 4

Entanglement Robustness in Trace Decreasing Quantum Dynamics 减迹量子动力学中的纠缠鲁棒性

Quanta Pub Date : 2021-09-03 DOI: 10.12743/quanta.v10i1.163

S. Filippov

引用次数: 4

KETERAMPILAN E-COUNSELING BAGI KONSELOR PENDIDIKAN DALAM MENINGKATKAN LAYANAN BIMBINGAN KONSELING DI SEKOLAH PADA ERA DIGITAL 5.0 在数字5.0时代，教育顾问改善学校咨询咨询服务的电子咨询技能

Quanta Pub Date : 2021-08-07 DOI: 10.22460/Q.V5I2P67-78.2636

A. Wibowo

引用次数: 0

Role of Steering Inequality in Quantum Key Distribution Protocol 转向不等式在量子密钥分发协议中的作用

Quanta Pub Date : 2021-06-24 DOI: 10.12743/quanta.v12i1.210

K. Mukherjee, T. Patro, Nirman Ganguly

{"title":"Role of Steering Inequality in Quantum Key Distribution Protocol","authors":"K. Mukherjee, T. Patro, Nirman Ganguly","doi":"10.12743/quanta.v12i1.210","DOIUrl":"https://doi.org/10.12743/quanta.v12i1.210","url":null,"abstract":"Violation of Bell's inequality has been the mainspring for secure key generation in an entanglement assisted Quantum Key Distribution (QKD) protocol. Various contributions have relied on the violation of Bell inequalities to build an appropriate QKD protocol. Residing between Bell nonlocality and entanglement, there exists a hybrid trait of correlations, namely correlations exhibited through the violation of steering inequalities. However, such correlations have not been put to use in QKD protocols as much as their stronger counterpart, the Bell violations. In the present work, we show that the violations of the Cavalcanti–Jones–Wiseman–Reid (CJWR) steering inequalities can act as key ingredients in an entanglement assisted QKD protocol. We work with arbitrary two-qubit entangled states, and characterize them by their utility in such protocols. The characterization is based on the quantum bit error rate and violation of the CJWR inequality. Furthermore, we show that subsequent applications of local filtering operations on initially entangled states exhibiting no violation, lead to violations necessary for the successful implementation of the protocol. An additional vindication of our protocol is provided by the use of absolutely Bell–Clauser–Horne–Shimony–Holt (Bell–CHSH) local states, states which remain Bell–CHSH local even under global unitary operations.Quanta 2023; 12: 1–21.","PeriodicalId":37613,"journal":{"name":"Quanta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46933243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Connection Between Quantum Probability and Geometry 论量子概率与几何的联系

Quanta Pub Date : 2021-06-18 DOI: 10.12743/quanta.v10i1.148

F. Holik

引用次数: 1

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