scholarly journals Multipartite Continuous Variable Quantum Conferencing Network with Entanglement in the Middle

2018 ◽  
Vol 8 (8) ◽  
pp. 1312 ◽  
Author(s):  
Zhaoyuan Zhang ◽  
Ronghua Shi ◽  
Ying Guo
Keyword(s):  
Mutual Information ◽  
Arbitrary Number ◽  
Continuous Variable ◽  
The State ◽  
High Rate ◽  
Entangled State ◽  
Community Or ◽  
Simulation Results ◽  
Multipartite Entangled State

We suggest a continuous variable quantum conferencing network scheme with an entangled source in the middle. Here, the source generates a multipartite entangled state and distributes the modes of the state to an arbitrary number of legitimate network users. The entangled modes that were received and measured by the users share mutual information, which is utilized to generate secure conferencing key between users. The scheme is proven secure against collective attacks on both the untrusted source in the middle and all the quantum links. Simulation results show that the presented scheme can achieve high rate secure conferencing for 100 users within a 400 m-radius community or factory area.

Rice Production in Punjab: Depletion of Water Resources and Environmental Problems

2020 ◽  
pp. 294-299
Keyword(s):  
State Government ◽  
Agricultural Development ◽  
Fruits And Vegetables ◽  
Central Government ◽  
Geographical Area ◽  
The State ◽  
Rice Production ◽  
Nutrient Loss ◽  
High Rate ◽  
Paddy Straw

Punjab has emerged as an important rice-producing state in the country. The state with 1.53 percent of the geographical area of the country produces more than 11 percent of total rice production in the country. The production of rice in Punjab increased more than 10 times due to an increase in area and yield. The growth of a rice crop at such a high rate over 20 years in Punjab is indeed a rare phenomenon in the history of agricultural development in the world. Due to extensive cultivation of rice in Punjab, the state has been over-exploiting the groundwater, more than its recharge. Most of the tube-well dominated districts of the state, witnessed the fall in water table more than 20 to 30 cm per year. To dispose of the paddy straw, the farmers of Punjab generally opt for burning it. This practice of burning of paddy straw besides nutrient loss is posing a serious problem for the public health and transportation system. Rice has now become a problematic crop for Punjab state due to its ill effects on its natural resources, that is, the water and soil environmental degradation. The Punjab Agricultural University experts and other committees estimated that the total groundwater recharge from all sources can sustain/support only 16-17 lakh ha of paddy in Punjab. The area under the crop increased to 29 lakh ha which was unsustainable in the long run. The area under rice in Punjab should be stabilized at 16-17 lakh ha and the remaining paddy area should be shifted to other crops like pulses, oilseeds, maize, fruits, and vegetables, etc. requiringless water, to achieve proper water balance. Thus diversification of some area from paddy is in the interest of Punjab farmers, State government and the Central government for long term food security on a sustainable basis.

A Multiregion Model with Capital Accumulation and Endogenous Amenities

2007 ◽  
Vol 39 (9) ◽  
pp. 2248-2270 ◽  
Author(s):  
Wei-Bin Zhang
Keyword(s):  
Capital Accumulation ◽  
Comparative Statics ◽  
The Other ◽  
High Rate ◽  
Unique Equilibrium ◽  
Economic Activities ◽  
Technological Differences ◽  
National Output ◽  
Simulation Results ◽  
Wage Disparities

The author develops a multiregional growth model with endogenous amenity and capital accumulation for any number of regions. The simulation results demonstrate that the national dynamics have a unique equilibrium. Comparative statics analysis shows that, if environmental improvement occurs in the technologically advanced (less advanced) region, the national output rises (falls). As a region improves its technology, the other two regions' aggregated output levels fall—not only in relative, but also in absolute, terms. This implies that if any region has a high rate of technological change and the other regions remain technologically stationary, then economic activities will tend to be concentrated in the technologically advancing region. It is also shown that technological differences appear to play only a small role in accounting for spatial wage disparities and endowments.

scholarly journals On-chip continuous-variable quantum entanglement

Nanophotonics ◽  
2016 ◽  
Vol 5 (3) ◽  
pp. 469-482 ◽  
Author(s):  
Genta Masada ◽  
Akira Furusawa
Keyword(s):  
Quantum Information ◽  
Integrated Circuits ◽  
Quantum Entanglement ◽  
Information Science ◽  
Essential Feature ◽  
Continuous Variable ◽  
Entangled State ◽  
Discrete Variable ◽  
Light Beams ◽  
Optical Circuits

AbstractEntanglement is an essential feature of quantum theory and the core of the majority of quantum information science and technologies. Quantum computing is one of the most important fruits of quantum entanglement and requires not only a bipartite entangled state but also more complicated multipartite entanglement. In previous experimental works to demonstrate various entanglement-based quantum information processing, light has been extensively used. Experiments utilizing such a complicated state need highly complex optical circuits to propagate optical beams and a high level of spatial interference between different light beams to generate quantum entanglement or to efficiently perform balanced homodyne measurement. Current experiments have been performed in conventional free-space optics with large numbers of optical components and a relatively large-sized optical setup. Therefore, they are limited in stability and scalability. Integrated photonics offer new tools and additional capabilities for manipulating light in quantum information technology. Owing to integrated waveguide circuits, it is possible to stabilize and miniaturize complex optical circuits and achieve high interference of light beams. The integrated circuits have been firstly developed for discrete-variable systems and then applied to continuous-variable systems. In this article, we review the currently developed scheme for generation and verification of continuous-variable quantum entanglement such as Einstein-Podolsky-Rosen beams using a photonic chip where waveguide circuits are integrated. This includes balanced homodyne measurement of a squeezed state of light. As a simple example, we also review an experiment for generating discrete-variable quantum entanglement using integrated waveguide circuits.

Aspołeczne „my”

2021 ◽  
Author(s):  
Piotr Bartula
Keyword(s):  
The State ◽  
Community Or ◽  
The Third ◽  
The Individual

ASOCIAL “WE” The problems discussed in the book are revealed by the well-known view of Aristotle that man is a cultural, social and political being: ...And he who by nature and not by mere accident lives outside the state, is either a wretch or superhuman being; he is ‘without lineage, law, hearth,‘ as denoted by Homer, because if someone is such a person by nature, he desires passionately war, being isolated, as a stone excluded from dice. Furthermore, It appears that the state is a creation of nature and most of all concerns the individual because when each person separately is not self-sufficient, he will be placed in the same relation to the state like these and other parts in relation to a whole. However, one who is unable to live in the community, or does not need it at all, being self-sufficient, such a person is not a member of the state, so he must be either a beast or god. Directed by the spirit of contrariness, I will add Friedrich Nietzsche’s comment : “Aristotle says that in order to live alone one must be either an animal or a god. The third alternative is lacking. A man must be both – a philosopher.”

On the Harm of Genocide

2018 ◽  
Vol 22 (1) ◽  
pp. 31-49
Author(s):  
Paul Kucharski
Keyword(s):  
Human Nature ◽  
The State ◽  
Human Condition ◽  
Human Beings ◽  
Community Or ◽  
The World ◽  
Scholarly Discussion ◽  
Insight Into ◽  
Individual Human ◽  
The Human Condition

My aim in this essay is to advance the state of scholarly discussion on the harms of genocide. The most obvious harms inflicted by every genocide are readily evident: the physical harm inflicted upon the victims of genocide and the moral harm that the perpetrators of genocide inflict upon themselves. Instead, I will focus on a kind of harm inflicted upon those who are neither victims nor perpetrators, on those who are outside observers, so to speak. My thesis will be that when a whole community or culture is eliminated, or even deeply wounded, the world loses an avenue for insight into the human condition. My argument is as follows. In order to understand human nature, and that which promotes its flourishing, we must certainly study individual human beings. But since human beings as rational and linguistic animals are in part constituted by the communities in which they live, the study of human nature should also involve the study of communities and cultures—both those that are well ordered and those that are not. No one community or culture has expressed all that can be said about the human way of existing and flourishing. And given that the unity and wholeness of human nature can only be glimpsed in a variety of communities and cultures, then part of the harm of genocide consists in the removal of a valuable avenue for human beings to better understand themselves.

Recent results in trapped-ion quantum computing at NIST

2001 ◽  
Vol 1 (Special) ◽  
pp. 113-123
Author(s):  
D. Kielpinski ◽  
A. Ben-Kish ◽  
J. Britton ◽  
V. Meyer ◽  
M.A. Rowe ◽  
...  
Keyword(s):  
The State ◽  
Entangled State ◽  
Bell’S Inequality ◽  
Ambient Conditions ◽  
Bell's Inequality ◽  
Quantum Register ◽  
Sigma Level ◽  
Universal Quantum ◽  
Encoding Method ◽  
First Time

We review recent experiments on entanglement, Bell's inequality, and decoherence-free subspaces in a quantum register of trapped {9Be+} ions. We have demonstrated entanglement of up to four ions using the technique of Molmer and Sorensen. This method produces the state ({|\uparrow\uparrow\rangle}+{|\downarrow\downarrow\rangle})/\sqrt{2} for two ions and the state ({\downarrow}{\downarrow}{\downarrow}{\downarrow} \rangle + | {\uparrow}{\uparrow}{\uparrow}{\uparrow} \rangle)/\sqrt{2} for four ions. We generate the entanglement deterministically in each shot of the experiment. Measurements on the two-ion entangled state violates Bell's inequality at the 8\sigma level. Because of the high detector efficiency of our apparatus, this experiment closes the detector loophole for Bell's inequality measurements for the first time. This measurement is also the first violation of Bell's inequality by massive particles that does not implicitly assume results from quantum mechanics. Finally, we have demonstrated reversible encoding of an arbitrary qubit, originally contained in one ion, into a decoherence-free subspace (DFS) of two ions. The DFS-encoded qubit resists applied collective dephasing noise and retains coherence under ambient conditions 3.6 times longer than does an unencoded qubit. The encoding method, which uses single-ion gates and the two-ion entangling gate, demonstrates all the elements required for two-qubit universal quantum logic.

ANALISIS KEBIJAKAN PEMERINTAH INDONESIA ATAS MORATORIUM TENAGA KERJA INDONESIA KE TIMUR TENGAH PADA TAHUN 2015

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Maria Dhiu ◽  
Ardli Johan Kusuma
Keyword(s):  
Middle East ◽  
Foreign Exchange ◽  
Migrant Workers ◽  
National Interest ◽  
The State ◽  
High Rate ◽  
Indonesian Government ◽  
East Region ◽  
The Government ◽  
Middle East Region

ABSTRACTThe Existance of Indonesian Workers in the Middle East, is very beneficial in terms of foreign exchange earnings. Despite the high rate of remittances generated, the Indonesian government must also implement a moratorium on migrant workers sending policies to the Middle East in 2015, which is feared that this could cause a reduction in the amount of remittances, secifically for the Middle East region. Here, the writer will discuss in dept why the government should carry out the moratorium policy of migrant workers to the Middle East in 2015, while the gorvernment  also know that the existance of the overseas migrant workers woud benefit economically. The writer see that, as the main actor, the state is obliged to provide protection for all its citizens whwrever they are.Keywords: Indonesia Workers, Moratorium, National Interest, Protecting Citizens. ABSTRAKKeberadaan Tenaga Kerja Indonesia di Timur Tengah, sangatlah menguntungkan dalam hal pendapatan devisa. Dibalik tingginya angka remitansi yang dihasilkan, namun pemerintah Indonesia juga harus menerapkan kebijakan moratorium pengiriman TKI ke Timur Tengah Tahun 2015, yang mana kebijakan tersebut dikhawatirkan dapat menyebabkan penurunan jumlah remitansi, secara khusus untuk kawasan Timur Tengah. Di sini, penulis akan membahas secara mendalam mengapa pemerintah harus melakukan kebijakan moratorius TKI ke Timur tengah Tahun 2015, sedangkan pemerintah juga tahu bahwa keberadaan TKI luar negeri tentu memberi keuntungan secara ekonomi. Penulis menggunakan sudut pandang realisme, dengan memakai teori kepentingan nasional, sehingga akan dibahas secara  mendalam terkait permasalahan yang ada. Dalam penelitian tersebut, penulis melihat bahwa, sebagai aktor utama, negara wajib memberikan perlindungan bagi seluruh warga negaranya di mana pun berada.Kata Kunci: Tenaga Kerja Indonesia, Moratorium, Kepentingan Nasional, Melindungi Warga Negara.

scholarly journals Probabilistic Resumable Quantum Teleportation of a Two-Qubit Entangled State

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 352 ◽  
Author(s):  
Zhan-Yun Wang ◽  
Yi-Tao Gou ◽  
Jin-Xing Hou ◽  
Li-Ke Cao ◽  
Xiao-Hui Wang
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
The State ◽  
Entangled States ◽  
Entangled State ◽  
Quantum Channels ◽  
Unknown State ◽  
Optimal Probability

We explicitly present a generalized quantum teleportation of a two-qubit entangled state protocol, which uses two pairs of partially entangled particles as quantum channel. We verify that the optimal probability of successful teleportation is determined by the smallest superposition coefficient of these partially entangled particles. However, the two-qubit entangled state to be teleported will be destroyed if teleportation fails. To solve this problem, we show a more sophisticated probabilistic resumable quantum teleportation scheme of a two-qubit entangled state, where the state to be teleported can be recovered by the sender when teleportation fails. Thus the information of the unknown state is retained during the process. Accordingly, we can repeat the teleportion process as many times as one has available quantum channels. Therefore, the quantum channels with weak entanglement can also be used to teleport unknown two-qubit entangled states successfully with a high number of repetitions, and for channels with strong entanglement only a small number of repetitions are required to guarantee successful teleportation.

scholarly journals Deterministic quantum teleportation through fiber channels

2018 ◽  
Vol 4 (10) ◽  
pp. eaas9401 ◽  
Author(s):  
Meiru Huo ◽  
Jiliang Qin ◽  
Jialin Cheng ◽  
Zhihui Yan ◽  
Zhongzhong Qin ◽  
...  
Keyword(s):  
Communication Networks ◽  
Quantum State ◽  
Optical Fibers ◽  
Quantum Teleportation ◽  
Continuous Variable ◽  
Entangled State ◽  
Optical Modes ◽  
Unknown Quantum State ◽  
Einstein Podolsky Rosen ◽  
Fiber Channels

Quantum teleportation, which is the transfer of an unknown quantum state from one station to another over a certain distance with the help of nonlocal entanglement shared by a sender and a receiver, has been widely used as a fundamental element in quantum communication and quantum computation. Optical fibers are crucial information channels, but teleportation of continuous variable optical modes through fibers has not been realized so far. Here, we experimentally demonstrate deterministic quantum teleportation of an optical coherent state through fiber channels. Two sub-modes of an Einstein-Podolsky-Rosen entangled state are distributed to a sender and a receiver through a 3.0-km fiber, which acts as a quantum resource. The deterministic teleportation of optical modes over a fiber channel of 6.0 km is realized. A fidelity of 0.62 ± 0.03 is achieved for the retrieved quantum state, which breaks through the classical limit of1/2. Our work provides a feasible scheme to implement deterministic quantum teleportation in communication networks.

A Fast Algorithm to Choose Delay Time for Strange Attractors

2011 ◽  
Vol 230-232 ◽  
pp. 1379-1383
Author(s):  
Peng Yao ◽  
Gai Rong Chen ◽  
Shao Hong Xu
Keyword(s):  
Mutual Information ◽  
High Precision ◽  
Satisfactory Result ◽  
Fast Algorithm ◽  
Delay Time ◽  
Traditional Method ◽  
Chaotic Systems ◽  
Phase State ◽  
State Reconstruction ◽  
Simulation Results

According to pseudo-periodicity and ergodicity of chaotic systems, we put forward a fast algorithm to determine delay time in phase state reconstruction. The traditional method to calculate mutual information is time-consuming and complicated to realize, which greatly restricts its application. In our algorithm we gradually reduce the feasible computing interval and adjust the calculating step until satisfactory result is gotten. This method overcomes the tedious calculation of mutual information and meanwhile guarantees high precision. Finally the simulation results of Rössler and Lorenz systems verify the feasibility of our algorithm.

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