首页
登录
职称英语
A key feature of quantum information science is the understanding th
A key feature of quantum information science is the understanding th
游客
2025-02-22
7
管理
问题
A key feature of quantum information science is the understanding that
groups of two or more quantum objects can have states that are entangled, such
that the members of an entangled collection of objects do not have their own
Line individual quantum states, only the group as a whole. Although one can use the
(5) mathematics of quantum theory to reason about entanglement, there is a great
danger that the classical basis of our analogies will mislead us. Despite its
strangeness, for a long time entanglement was regarded as a curiosity and was
mostly ignored by physicists and this changed when Bell predicted and
confirmed that entangled quantum systems exhibit behavior that is impossible in
(10) a classical world-impossible even if one could change the laws of physics to try
to emulate the quantum predictions within a classical framework of any sort.
The idea that entanglement falls wholly outside the scope of classical physics
prompted researchers to ask whether entanglement might be useful as a
resource for solving information-processing problems in new ways.
(15) Entanglement measures improve how researchers can analyze tasks such as
quantum teleportation and algorithms on quantum-mechanical computers.
Classical computation and communications have a well-developed assortment of
error-correcting codes to protect information against the depredations of noise,
an example being the repetition code. This scheme represents the bit 0 as a
(20) string of three bits, 000, and the bit 1 as a string of three bits, 111. If the
noise is relatively weak, it may sometimes flip one of the bits in a triplet,
changing, for instance, 000 to 010, but it will flip two bits in a triplet far less
often. Whenever we encounter 010 (or 100 or 001), we can be almost certain
the correct value is 000, or 0.
(25) Initially it appeared to be impossible to develop codes for quantum error
correction because quantum mechanics forbids us from learning with certainty
the unknown state of a quantum object-the obstacle, again, of trying to
extract more than one bit from a quantum bit. One cannot examine each copy of
a quantum bit and see that one copy must be discarded without altering each and
(30) every copy in the process, and making the copies in the first place is nontrivial:
quantum mechanics forbids taking an unknown quantum bit and reliably making
a duplicate, a result known as the no-cloning theorem. Clever ideas developed
independently by Shor showed quantum error correction can be performed
without ever learning the states of the quantum bits or needing to clone them.
(35) As with the triplet code, each value is represented by a set of quantum bits and
it is as if one ran the triplet 010 through a circuit that could spot that the middle
bit was different and flip it "sight unseen". [br] According to the passage, which of the following are true about the repetition code? Ⅰ. While just now being applied to quantum mechanics, the repetition code has long been the primary means of error correction in classical mechanics. Ⅱ. Weak noise tends to affect the reliability of the code more adversely than strong noise. Ⅲ. Repetition code never represents a bit or string of bits in fewer bits than actually exist.
选项
A、Ⅱ only
B、Ⅲ only
C、Ⅰ and Ⅱ only
D、Ⅱ and Ⅲ only
E、Ⅰ, Ⅱ, and Ⅲ
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967260.html
相关试题推荐
Scienceandsocietyare______collaborators:Inthebestofworldswemayachieve
Roger’sunderstandingofthepointillisttechniqueisprofound,albeitthoroughl
Traditionallyeconomicswasdubbedthe"dismalscience"inresponset
Thediscoveriesofthesocialsciences,onceisolatedandlabeled,are______conv
Britishpoliticalscientistsoncehaddifficultyunderstandinghowtheunbalanci
DRAMA:SCENE::A、information:cipherB、prose:paragraphC、novel:raconteurD、o
Informationonbehavioraldeficitsinratsisalso______tohumans,butthereis
Akeyfeatureofquantuminformationscienceistheunderstandingth
Societyisgenerallyamenabletosubsidizingscience’sexpensive
Societyisgenerallyamenabletosubsidizingscience’sexpensive
随机试题
EuphemismI.OverallIntroductionofEuphemismA.
Today’skindergartenersareheavierthankidsbroughtupinthe1970sand19
假设Excel工作表的部分信息如下所示,如果用户在A3单元格中输入=SUM(MA
社交网络平台(SNS)的主要功能之一是建立在线群组,群组中的成员之间可以互相分享
控制图中的控制上限和控制下限标明( )。A.客户将要接受的界限 B.可能出现
关于老年人用药原则叙述,错误的是A、应用最少药物治疗原则 B、从最低有效剂量开
关于无人值守变电站自动化系统的技术要求,下列说法正确的是:()。(A)应具备功能
当理财师本人因为工作调动等原因不能再服务客户时,根据理财规划的(),金融机构需
BPRS的计分方法有( )。A.总分 B.因子分 C.单项分 D.
A.副作用 B.继发反应 C.首剂效应 D.特异质反应 E.致畸、致癌和
最新回复
(
0
)