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arXiv 0810.2937quant-ph
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具有共享随机性的量子随机接入码

Quantum Random Access Codes with Shared Randomness

Andris Ambainis, Debbie Leung, Laura Mancinska, Maris Ozols

摘要:

我们考虑一种通信方法,其中发送方将n个经典比特编码为1个量子比特,并将其发送给接收方,接收方根据必须恢复的初始比特进行一定的测量。这个过程被称为(n,1,p)量子随机接入码(QRAC),其中p > 1/2是它的成功概率。已知存在(2,1,0.85)和(3,1,0.79)QRAC(没有经典的对应物),并且p > 1/2的(4,1,p)QRAC是不可能的。我们扩展了这个模型与共享的随机性(SR),这是双方都可以访问。则对于任意n > 0,存在具有SR且p > 1/2的(n,1,p)QRAC。我们给出了其成功概率的上界(已知的(2,1,0.85)和(3,1,0.79)QRAC符合这个上界)。我们讨论几个小的n值的一些特殊的结构。我们还研究了这个模型的经典对应物,其中n比特被编码成1比特而不是1量子比特,并且使用SR。我们给出了这样的代码的最佳结构,并找到他们的成功概率正是-它是小于在量子的情况下。交互式3D量子随机存取码可在http://home.lanet.lv/~sd20008/racs在线获得。

英文摘要:

We consider a communication method, where the sender encodes n classical bits into 1 qubit and sends it to the receiver who performs a certain measurement depending on which of the initial bits must be recovered. This procedure is called (n,1,p) quantum random access code (QRAC) where p > 1/2 is its success probability. It is known that (2,1,0.85) and (3,1,0.79) QRACs (with no classical counterparts) exist and that (4,1,p) QRAC with p > 1/2 is not possible. We extend this model with shared randomness (SR) that is accessible to both parties. Then (n,1,p) QRAC with SR and p > 1/2 exists for any n > 0. We give an upper bound on its success probability (the known (2,1,0.85) and (3,1,0.79) QRACs match this upper bound). We discuss some particular constructions for several small values of n. We also study the classical counterpart of this model where n bits are encoded into 1 bit instead of 1 qubit and SR is used. We give an optimal construction for such codes and find their success probability exactly--it is less than in the quantum case. Interactive 3D quantum random access codes are available on-line at http://home.lanet.lv/~sd20008/racs .

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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