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
2024-01-11
12
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] The passage implies that all of the following true is true concerning classical means of error correction EXCEPT
选项
A、The string 1110 should be interpreted to represent 1
B、The string 2020 should be interpreted to indicate the presence of noise
C、A four digit code is more likely to be accurate than a three digit code
D、It is permissible to duplicate the bits in a code
E、Three digits in agreement, such as 111, indicate the absence of degradation
答案
E
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3352701.html
相关试题推荐
Itisgenerallybelievedthatteachingis______itisascience.A、anartmuchas
Understandingthistransitionrequiresalookatthetwo-sidedconnectionbet
Asweknow,physics______thescienceofenergy.A、wasB、wereC、isD、areC一些词尽管是以-
Thiskindofcomputeris______handlingallkindsofinformation.A、capabletoB、a
Bigdatacanbedefinedasinformationthatistoobigorcomplextobe
Bigdatacanbedefinedasinformationthatistoobigorcomplextobe
Understandingthistransitionrequiresalookatthetwo-sidedconnectionbetw
Ecologyisthescienceofhowlivingcreaturesandplantsexisttogetherand
Ecologyisthescienceofhowlivingcreaturesandplantsexisttogetherand
Ecologyisthescienceofhowlivingcreaturesandplantsexisttogetherand
随机试题
Onaverage,Americankidsaged3to12spent29hoursaweekinschool,eigh
失血对生命活动无显著影响,则一次失血量最多不能超过全血量的比例是()。A.5%
筏板基础混凝土浇筑完毕后,表面应覆盖和洒水养护的时间不少于()d。A.7 B
(2017年真题)《中华人民共和国证券投资基金法》关于基金委托人的相关规定,下列
下面关于成本加成定价模型的叙述,错误的是()。A.贷款价格=资金成本+贷款费用
近年来,随着汽车销量的上升,洗车行业迅速发展。由于洗车业务不需要复杂的技术和大量
A公司签发一张以B公司为收款人的银行承兑汇票(承兑银行已经签章),用于支付
(2021年真题)根据合同法律制度的规定,在保证人与债权人没有约定保证期间的情形
(2021年真题Ⅰ)悬臂梁跨度2.1米,当强度达到设计强度等级的()可以拆
矿业工程合同文本中,关于合同文件解释权优先顺序的说法,正确的是()。A.中标通知
最新回复
(
0
)