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
9
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
Writeanoteofabout50-60wordsbasedonthefollowingsituation:Writ
Itisnaturalthatatreewouldgrowbestinaclimatewithplentyofsunlig
[originaltext]W:Goodevening,sir.Hereisthemenu.Wouldyouliketoordern
Thepolicearrivedatthespot,______thesituationbecamecalmer.A、beforewhic
安全教育措施中,包括意识,知识,技能,态度,观念等综合安全素质的内容。()
患者,男,21岁。头枕部被铁棍击伤,昏迷约10分钟,醒后不能回忆当时受伤情况,并
共用题干 第一篇TheNationalParkServiceAmeric
急性化脓性腹膜炎腹痛的特点是A.无确切疼痛部位 B.常为阵发性绞痛 C.排便
下列说法中,正确的是( )。A.大赦既赦其刑,又赦其罪B.特赦只赦其刑
建筑安装工程费用构成中,将施工塔式起重机由一施工地点运至另一施工地点的运输、装卸
最新回复
(
0
)