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
46
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 assertion in the third paragraph that quantum mechanics forbids the duplication of unknown quantum bits tends to support the view that
选项
A、the simple classical triplet code used in repetition code would probably fail for quantum error correction
B、the process of copying information in quantum mechanics affects the value of the thing copied
C、computation codes in quantum mechanics tend to be more susceptible to noise than those in classical mechanics
D、quantum mechanics tends to be more limited in its potential applications than classical mechanics
E、quantum mechanics is ill-suited to the problems of error correction
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352697.html
相关试题推荐
Itisgenerallybelievedthatteachingis______itisascience.A、anartmuchas
Hehasmadeanotherwonderfuldiscovery,______ofgreatimportancetosciencean
Technologyhasfacilitatedthedeliveryofinformation,thus______moreinforma
Understandingthistransitionrequiresalookatthetwo-sidedconnectionbet
Thiskindofcomputeris______handlingallkindsofinformation.A、capabletoB、a
Bigdatacanbedefinedasinformationthatistoobigorcomplextobe
Bigdatacanbedefinedasinformationthatistoobigorcomplextobe
Understandingthistransitionrequiresalookatthetwo-sidedconnectionbetw
Asweknow,physics_________thescienceofenergy.A、wasB、wereC、isD、areC一些词尽管
Ecologyisthescienceofhowlivingcreaturesandplantsexisttogetherand
随机试题
[originaltext]M:So,you’veseenobviouslylifeinFrance,familylifeinFranc
HowtoWriteChildren’sLiterature?TheauthorofDannytheDragonMeetsJimmyi
男性,广泛前壁心肌梗死2周后出现发热、胸痛和气短,无咳嗽,查体颈静脉怒张,X线胸
乳癖的肿块特点是A:质地不硬,活动度好,表面光滑 B:坚硬如石,表面不平,固定
被NCCLS推荐为检查尿蛋白定性的确证试验是A:试带法B:加热乙酸法C:沉淀
( )可能有客观的物质性成果的产出。A.服务性组织 B.管理性组织 C.生
对缺铁性贫血者应选用()A.叶酸+维生素B12 B.富马酸亚铁 C.维生素
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
(2021年第1批真题)关于建设工程施工垫资的说法正确的是()。A.垫资的法
某施工单位在进行脚手架模板的架设过程中发生了坍塌事故,事故造成11人重伤,直接经
最新回复
(
0
)