c****t
发帖数: 19049 | 1 Some particles such as photons and electrons, when brought together and then
separated, can become “entangled” and exist in the same quantum
mechanical state.
This quantum mechanical state, prior to any form of measurement, possesses
indefinite properties such as position in space, spin, and polarization.
Such properties remain indefinite until they are measured, at which point
they take on definite values such as a particular location in space or a
clockwise spin. After one such entangled parti... 阅读全帖 |
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发帖数: 1 | 2 QUANTUM SPACE ELEMENTS (QSE)
INTRODUCTION
This is a non-mathematical proposal introducing a cosmological model that is
cyclic, deterministic and infinity-free. For the purpose of achieving this
objective a number of new concepts are introduced. The framework of this
proposal is structured over a number of assumptions, leading to various
considerations of cosmological concerns. Furthermore, verification methods
are suggested of both, observational and mathematical nature.
ASSUMPTIONS
Space is dis... 阅读全帖 |
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z*******n
发帖数: 1034 | 3 Google sets up a research lab to build quantum-computing hardware
Image Credit: Google
September 2, 2014 3:26 PM
Jordan Novet
The always-innovative Google has come up with its own technology for storing
data, running applications, and learning from huge data sets. Now Google is
developing the best hardware for quantum computing.
The news came today in a blog post in which the tech giant admitted to
having set up a “hardware initiative” as part of its quantum artificial
intelligence lab, with hel... 阅读全帖 |
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R*******N
发帖数: 7494 | 4 CHICAGO (Reuters) - U.S. physicists have coaxed tiny artificial atoms into
communicating in an advance that may lead to super-fast quantum computers,
the researchers said on Wednesday.
Quantum computers hold the promise of being enormously powerful, capable of
solving in seconds problems that take today's fastest machines years to
crack.
So far, physicists have worked mostly on developing the most basic of
elements that can store information known as quantum bits, or qubits.
But a series of pape... 阅读全帖 |
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c*w
发帖数: 4736 | 5 I've worked on fault-tolerant quantum computation before, so I
might provide you with some useful information. But it's hard
to forcast the future of the field.
I guess the word "quantum computation" has different meanings
to physicists and computer scientists.
To physicists, it is mainly associated with quantum information.
It's a field studying the QM of qubits. It includes many things
like quantum cryptography, quantum teleportation etc. Quantum
computer and quantum computation is just a part |
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f******y
发帖数: 2971 | 6 【 以下文字转载自 Programming 讨论区 】
发信人: convergence (Rex), 信区: Programming
标 题: 有人做quantum computing system吗？
发信站: BBS 未名空间站 (Thu May 16 21:14:05 2013, 美东)
d-wave这加canada公司，竟然走在了硅谷前面，连nasa都向他们购买quantum
computing system。 有人做这个的吗，同时存在0和1确实有点理论物理的味道。
“ The laws of quantum physics, which govern the microscopic world, allow
bits of matter to be in two states simultaneously.
All modern-day computing relies on the ultra-fast manipulation of billions
of bits of information.
Quantum computing combines these tw... 阅读全帖 |
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y*b
发帖数: 3190 | 7 http://www.sonyalpharumors.com/sony-to-work-with-invisage-on-ne
"Invisage CEO Jess Lee stated that Sony is likely to become a Invisage
partner to make the first mass production Quantum film stacked sensors in
2016. The sensors will be first used on smartphones because one of the main
advantages of the new tech is the much thinner sensor. But the new tech
could be used on larger Digital Camera sensors too because of the higher
performance. Quantum Film sensor tech explained via Wikipedia:
Quantum... 阅读全帖 |
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c*********e
发帖数: 16335 | 8 d-wave这加canada公司，竟然走在了硅谷前面，连nasa都向他们购买quantum
computing system。 有人做这个的吗，同时存在0和1确实有点理论物理的味道。
“ The laws of quantum physics, which govern the microscopic world, allow
bits of matter to be in two states simultaneously.
All modern-day computing relies on the ultra-fast manipulation of billions
of bits of information.
Quantum computing combines these two ideas, allowing us to put bits of
information into their 0 and 1 states at the same time. This process allows
quantum computers to consider and mani... 阅读全帖 |
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q**i
发帖数: 174 | 9 one can design a quantum computer where a change in one partical's quantum
status can impact quantum status of another partical. a signal (a
change in a partical's quantum status) can be transmitted to a remote party
through such a quantum device.
Question: is the transmission instantaneous? or at a speed less than that
of light (or if the process is superluminal?) |
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l**********n
发帖数: 72 | 10 Currently the quantum coherence thing is still a mistery and it's good to do
some experiments to check the foundation of the quantum mechanics. Besides, I
think whatever they name it, quantum computer or quantum communication is just
a fad, but it's easy to get research fund and not a bad research topic in
terms of fundamental physics. For example, although you could avoid all the
deherence effects, I doubt the quantum states would collapse suddenly at the
same time when they are far apart( I do |
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J*******3
发帖数: 1651 | 11 One Hundred Years of Quantum Physics
Daniel Kleppner and Roman Jackiw*
An informed list of the most profound scientific developments of the 20th
century is likely to include general relativity, quantum mechanics, big bang
cosmology, the unraveling of the genetic code, evolutionary biology, and
perhaps a few other topics of the reader's choice. Among these, quantum
mechanics is unique because of its profoundly radical quality. Quantum
mechanics forced physicists to reshape their ideas of reality, |
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D****n
发帖数: 21 | 12 One Hundred Years of Quantum Physics
Daniel Kleppner and Roman Jackiw*
An informed list of the most profound scientific developments of the 20th ce
ntury is likely to include general relativity, quantum mechanics, big bang c
osmology, the unraveling of the genetic code, evolutionary biology, and perh
aps a few other topics of the reader's choice. Among these, quantum mechanic
s is unique because of its profoundly radical quality. Quantum mechanics for
ced physicists to reshape their ideas of rea |
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w*******y
发帖数: 60932 | 13 Casino Royale:
http://www.bestbuy.com/site/Casino Royale - Widescreen Collector's Dubbed - Blu-ray Disc/9008469.p?id=1620940&skuId=9008469
#39;s+Dubbed+-+Blu-ray+Disc/9008469.p?id=1620940&skuId=9008469" rel="
nofollow" target="_blank" onclick="_gaq.push(['_trackEvent', 'thread', '
click', '2970611 - best-buy-blu-rays-under-10-casino-royale-quantum-of-
solace-kill-bill-vol-12-no-country-for-old-men']);">Casino Royale [Casino
Royale:
http://www.bestbuy.com/site/Casino Royale - Widescreen Collector... 阅读全帖 |
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发帖数: 1 | 14 我猜测那个oled 还是 yellow and blue 材料的oled。不是真正的RGB oled。所以属于
有一点cut corners。即便这样 oled 的生产成本还是要比 quantum dot 高。贵几百
块 不奇怪。
从颜色上 两种技术都有wide color. quantum dot 也许对比度不行 但是色彩方面 应
该不会比现在的oled 差。很多时候 不是 技术上的差别 而是 厂家calibration 的差
别。
[在 classicfree (free) 的大作中提到：]
:quantum dot 是三星ks800，oled是lg b6。我觉得lg那个颜色不太生动。但是oled贵
几百刀，评价也高，为什么？ |
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d*****u
发帖数: 17243 | 15 发在nature上了
Today we published the results of this quantum supremacy experiment in the
Nature article, “Quantum Supremacy Using a Programmable Superconducting
Processor”. We developed a new 54-qubit processor, named “Sycamore”, that
is comprised of fast, high-fidelity quantum logic gates, in order to
perform the benchmark testing. Our machine performed the target computation
in 200 seconds, and from measurements in our experiment we determined that
it would take the world’s fastest supercomputer ... 阅读全帖 |
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d*****r
发帖数: 5934 | 16 The Volkl Quantum 8 maintains a well dampened, comfortable feel over a forgi
ving 102 square inch midplus head. It's arm friendly while still retaining a
solid, stable feel when hitting groundstrokes. We also found a heavier feel
than this racquet's 10.3 ounce stationary weight would suggest. A conclusio
n perhaps helped in part by the Quantum 8's slight head light balance and ex
tended length (27.6 inches). Finally, the Volkl Quantum 8's string pattern i
s a little denser in the middle (sweetsp |
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d*****r
发帖数: 5934 | 17 The Quantum 5 is the lightest and stiffest racquet in the Quantum Series. It
will likely appeal to 3.0 to 4.0 NTRP level players who seek moderate power
in a lighter swinging oversize 'tweener. There's good control for players w
ith moderate to fast swings, while the tear-drop head shape contributes to a
forgiving, yet solid feel and an extended sweetspot. The Volkl Quantum 5 al
so features a Sensor Handle System, designed to dampen vibration without sac
rificing feel. |
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c********s
发帖数: 123 | 18 It's in the college back in China. We had this Quantum Mechanics test.
Our teacher is probably one of the best Quantum Physics scientists in China.
He is the leader of Quantum Optics research. We were pretty lucky because
we were told he used to give lectures in English but he did not
use English at that time. Still his lecture material can not be found no
where in the text book. At the end of the semester, he told us
then the level of the exam is Graduate Level. //fear
We had to all haul our as |
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T*******y
发帖数: 6523 | 19 I noticed that he appeared in the 2004 film "What the Bleep Do We Know!?" I watched that movie before, and the critics about that movie was that the interviewees were all influenced by Ramtha, and they had similar views. Namely, this could be a one-sided story.
http://www.amazon.com/What-Bleep-Do-We-Know/product-reviews/B00
Personally I like the tone of this movie, but I feel that it's over-using, or potentially abusing, quantum mechanics. Even quantum mechanics is in development, and people see... 阅读全帖 |
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a*********n
发帖数: 2526 | 20 我觉得amit goswami 在电影的前半部分分析很给力，但是后半部有一点过分解读和应
用，这很不符合科学的精神，不能够对一个hyopthesis过分的引申。相比他有自己的社
会和政治目的，像他对达赖的背书，但是overall还是给人耳目一新的感觉
I watched that movie before, and the critics about that movie was that the
interviewees were all influenced by Ramtha, and they had similar views.
Namely, this could be a one-sided story.
or potentially abusing, quantum mechanics. Even quantum mechanics is in
development, and people seemed to notice and were trying to find the
particles that moved faster than the speed o... 阅读全帖 |
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R*******N
发帖数: 7494 | 21 CHICAGO (Reuters) - U.S. physicists have coaxed tiny artificial atoms into
communicating in an advance that may lead to super-fast quantum computers,
the researchers said on Wednesday.
Quantum computers hold the promise of being enormously powerful, capable of
solving in seconds problems that take today's fastest machines years to
crack.
So far, physicists have worked mostly on developing the most basic of
elements that can store information known as quantum bits, or qubits.
But a series of pape |
|
l**********n
发帖数: 72 | 22 Here are some articles talking about quantum information transfer and
processing.
"Teleporting an unknown quantum state via dual classical and
Einstein-Podolsky-Rosen channels", C. H. Bennett et al, Phys. Rev. Lett. 70,
1895-1899 (1993)
"Long Distance, Unconditional Teleportation of Atomic States via Complete Bell
State Measurements", S. Lloyd et al, Phys. Rev. Lett. 87, 167903 (2001)
If you type in "Quantum information" in PROLA, this is typically what you can
get
Showing results 1 through 10 |
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l**********n
发帖数: 72 | 23 Hi, fisherdad:
For the moment, we don't know anything about how far the particles would lose
their coherence intrinsically, isn't that true? I guess for the current
technology, the probing distance is around 1 cm at most.
Second, I am not smart enough to propose a realistic way of quantum
information transfer, but according to the basic principle of quantum
mechanics, there is NO distance limit for the quantum coherence of the
particles. What I am saying is that if there is no decoherence due to |
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w***h
发帖数: 3343 | 27 Science DOI: 10.1126/science.1234414
http://www.sciencemag.org/content/early/2013/03/13/science.1234
Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic
Topological Insulator
Cui-Zu Chang1,2,*, Jinsong Zhang1,*, Xiao Feng1,2,*, Jie Shen2,*, Zuocheng
Zhang1, Minghua Guo1, Kang Li2, Yunbo Ou2, Pang Wei2, Li-Li Wang2, Zhong-
Qing Ji2, Yang Feng1, Shuaihua Ji1, Xi Chen1, Jinfeng Jia1, Xi Dai2, Zhong
Fang2, Shou-Cheng Zhang3, Ke He2,†, Yayu Wang1,†, Li Lu2, Xu-Cun
... 阅读全帖 |
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O***O
发帖数: 1854 | 28 Google announced a breakthrough in the field of quantum computing Wednesday.
The company thinks it's found a quantum algorithm that solves problems 100
million times faster than conventional processes. If confirmed, this
discovery could not only lead to iRobot-style artificial intelligence but
also advance the US space program by light years. |
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m**c
发帖数: 7349 | 29 “All the world’s a stage…,” Shakespeare wrote, and physicists tend to
think that way, too.
Space seems like a backdrop to the action of forces and fields that inhabit
it but space itself is not made of anything—or is it? Lately scientists
have begun to question this conventional thinking and speculate that space—
and its extension according to general relativity, spacetime—is actually
composed of tiny chunks of information.
These chunks might interact to create spacetime and give rise to its
pro... 阅读全帖 |
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J****u
发帖数: 802 | 30 在Quantum Corp看到一个opening, 想请在Quantum工作的XDJM帮忙递一个简历，跪谢
！ |
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W*******s
发帖数: 18705 | 31 这个EbaySeller的动作真快，前后三天就到货了。左手超快轮，Quantum Smoke
SL151HPT，6.8盎司，34 Inch Per Turn，属于Bass轮子中目前最快级别的轮子了。打
开轮子看看，没有发现“著名”的Quantum红色HotSauce的痕迹，没有跟小油瓶，这个
到无所谓，我有很多小瓶轮油，再用10几年也够了。材料没啥特别，颜色暗黑色无光，
Logo很隐晦，基本看不出来，远点看就是个暗黑轮子，配StCroix Avid杆子，颜色浑然
天成，非常搭配。上线后摇轮，没有特别Milky Smooth，也没有不顺，同其他同级别的
轮子差不多，其实新轮摇动顺滑都差不多，闭着眼睛摇都不知道是哪个。在家里试试
Pitching，距离满意，特别满意的是收线速度真TMD的给力啊，其他轮子要手5，6下，
它3，4次就搞定了。这是我最快的轮子，开光已经迫不及待了。 |
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n****n
发帖数: 492 | 33 Definition: much, much better than something else
origin : This expression comes from the field of nuclear physics.
According to the Morris Dictionary of word and Phrase Origins,
we use "a quantum leap"(or jump) to mean "any sudden and
dramatic change, especially in the field of scientific research,
scholarship and learning."
Many people in China find the quality of their lives today to be a quantum
leap over the quality of their lives 10 |
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B**********e
发帖数: 50 | 34 Interesting.
Our brain does not have the raw computing power of modern day computers, yet
we have consciousness. The brain certainly takes shortcuts of extraordinary
kinds to achieve this feat. And Sr. Penrose just proposed the means by
which this shortcut could conceivably be achieved in our brain. What's going
on inside our brain, the bridging place between quantum mechanics and
einsteinian relativity, a biological quantum computer?
Fascinating.
I wish I was still back in school, to pursue the... 阅读全帖 |
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w****i
发帖数: 233 | 35 刚upgrade成FIOS Quantum internet 50/25， 每个月要交7.99 wireless router rent
。想买一个，verizon官网的这个FiOS Quantum Gateway router要199，太贵了。大家
能否推荐一个大家觉得好用的router？非常感谢！ |
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c*s
发帖数: 2145 | 36 发信人: l***[email protected] (一叶孤舟), 信区: NanoST
标 题: Top 25 papers about Quantum Dots
发信站: BBS 水木清华站 (Sat Dec 21 08:44:00 2002)
转信站: Philly!news.cn99.com!maily.cic.tsinghua.edu.cn!SMTH
无意间看到的，也不知道是否属实
***Article 1
Total Cites: 772
Article Title: SEMICONDUCTOR CLUSTERS, NANOCRYSTALS, AND QUANTUM DOTS
Authors: Alivisatos, AP
Journal: SCIENCE
Volume: 271
Page: 933-937
Year: 1996
Addresses:
?UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA, USA
?UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, |
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w********h
发帖数: 12367 | 37 【 以下文字转载自 Chemistry 讨论区,原文如下 】
发信人: wonderlich (左岸，遁去), 信区: Chemistry
标 题: Re: quantum efficiency怎么算？
发信站: The unknown SPACE (Sun Mar 9 17:57:14 2003) WWW-POST
Fluorescence quantum efficiency is obtained by comparing
the intergration of the emission spectra (in wavenumbers)
of the samples (unknown) with that of a known standard in
the same optical configuration using the relation
fi (unknown)=[(As*Fu*n^2)/(Au*Fs*n0^2)]*fi (standard)
u, s means unknown and standard.
A is the absorbance at the e |
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w*******u
发帖数: 271 | 38 朋友在达拉斯的律所在招一个patent agent，客户做quantum computing的所以需要懂
quantum physics。需要绿卡，最好有PTO registration。 有兴趣的可以微信联系
CharlesDallas，我可以帮递简历。 |
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w*******u
发帖数: 271 | 39 朋友在达拉斯的律所在招一个patent agent，客户做quantum computing的所以需要懂
quantum physics。需要绿卡，最好有PTO registration。 有兴趣的可以微信联系
CharlesDallas，我可以帮递简历。 |
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l**********n
发帖数: 72 | 40 Some of my understandings to the problem.
First, consider the EPR experiments and many similar experiments, the
macroscopically separated particles are in a coherent state, and when you
measure the state of one particle at A locally, the state of another particle
far apart at B is determined by the measurement at A. This is the basic
assumption of Quantum Mechanics at the present stage. And the collapse of the
quantum state is NOT transmitted via electromagnetic interaction.
Second, when the mac |
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h******x
发帖数: 13 | 41 Further Advances In Quantum Computing
Posted by Hemos on Wednesday November 01, @12:15AM
from the a-quiet-place-in-subspace dept.
Porfiry writes: "Scientists at the U.S. Department of Energy's Los
Alamos National Laboratory have taken another step forward in
the quest for a quantum-based computer by demonstrating the
existence of a physical state immune to certain types of
information-corrupting "noise," which could otherwise disrupt |
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l**********n
发帖数: 72 | 42 Basically the electron transport through nano-wires or quantum dots doesn't
satisfy the quasi-free semi-classical Drude electron transport model, the
phase coherent length of the electrons is very large compared to the physical
dimension of the system and the impurities or contacts scatter strongly with
the individual electrons. Therefore, the physics of the quantum transport
becomes quite similar to the Kondo problem where the resistance at low
temperature shows the divergence behavior as a*ln( |
|
Eg
发帖数: 80 | 43
That also depends --- but definitely not that many for the cases I know! It
seems you are considering a quantum dot as a 3D box (I saw in your original
post you said 500nm^3) --- that's a very wrong idea, the confine ment in Z
direction is very different with that of the XY surface. You'd better read
some introductory quantum dot book first.
That's a kinda easy idea but not that easy to realize. Just imagine, how do
you control the density --- most people use a frontgate. Then learn from the
in |
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x********u
发帖数: 18 | 44 发信人: xiaoheizhu (cheer up), 信区: Chemistry
标 题: 荧光:triplet寿命，quantum efficiency和荧光光谱峰形的关系是什么?
发信站: The unknown SPACE (Thu Oct 17 20:02:17 2002) WWW-POST
triplet寿命，quantum efficiency对1光谱有什么影响?
比如10微秒 0.001for bleaching |
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l**********n
发帖数: 72 | 45 From Heisenberg uncertainty principle, you could do an order of magnitude
estimation. The linewidth should be around 10 kHz. The quantum efficency is
basically how much you get vs. how much you pump.
So, the triplet life time determines the natural linewidth and the quantum
efficiency gives you the comparable peak value of the absorption spectrum. |
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w*******y
发帖数: 60932 | 47 Link:
http://www.bestbuy.com/site/James Bond 007: Quantum of Solace 007 T-Shirt Offer - Xbox 360/9093107.p?id=1218020986626&skuId=9093107&st=Quantum of Solace 007 T-Shirt&lp=1&cp=1
Have at it.
|
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J*V
发帖数: 3150 | 48 Science DOI: 10.1126/science.1234414
http://www.sciencemag.org/content/early/2013/03/13/science.1234
Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic
Topological Insulator
Cui-Zu Chang1,2,*, Jinsong Zhang1,*, Xiao Feng1,2,*, Jie Shen2,*, Zuocheng
Zhang1, Minghua Guo1, Kang Li2, Yunbo Ou2, Pang Wei2, Li-Li Wang2, Zhong-
Qing Ji2, Yang Feng1, Shuaihua Ji1, Xi Chen1, Jinfeng Jia1, Xi Dai2, Zhong
Fang2, Shou-Cheng Zhang3, Ke He2, |
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