Download e-book for kindle: The physics of quantum information: quantum cryptography, by Dirk Bouwmeester, Artur K. Ekert, Anton Zeilinger

By Dirk Bouwmeester, Artur K. Ekert, Anton Zeilinger

"The editors even though have performed a superb activity of sewing jointly a worthwhile tapestry of the sphere because it stands today...The Physics of Quantum details is vital studying for somebody new to the sphere, quite in the event that they input from the path of quantum optics and atomic physics." -The Physicist

"Unreservedly instructed, and deserving of a spot in any Physics library." -Andrew Davies, division of Defence, Canberra, Australia

Leading specialists from "The Physics of Quantum details" community, an initiative of the eu fee, compile the latest result of the rising region of quantum expertise. Written in a constant sort as a study monograph, the e-book introduces into quantum cryptography, quantum teleportation, and quantum computation, contemplating either idea and most up-to-date experiments. hence scientists operating within the box and complex scholars will discover a wealthy resource of knowledge in this intriguing new zone.

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Extra info for The physics of quantum information: quantum cryptography, teleportation, computation

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6 Repunits Expressed as binary numbers, all numbers of the form 2n − 1 consist exclusively of 1’s, namely exactly n 1’s. For example M4 = 24 − 1 = 15, or 1111 in binary. Similarly, for any a, (an − 1)/(a − 1) expressed in base a consists of precisely n 1’s and no other digits. Such numbers are called “repunits”, and apart from those to the base 2, those to base 10 have been the most widely studied. For a repunit to be prime, n must be prime, but as with the Mersenne numbers, that is not sufficient.

3) However, not all primes p yield Mersenne primes, the first exception being p = 11, because 211 −1 = 2047 = 23·89. Still, there is a fairly simple primality test for numbers of the form 2p − 1, the so-called Lucas Test: 2p − 1 is prime iff (note the double f , meaning if and only if ) Mp divides Sp (p > 2), where Sn is defined by the recursion 3 Can the reader specify a nonrecursive algorithm, i. , one that gives the nth prime directly, without calculating all prior ones? 4) starting with S2 = 4.

30 3. Primes Fig. 1. The sieve of Eratosthenes (modulo 6) In applying Eratosthenes’s sieve method there is an additional trick that simplifies matters considerably: we write the integers in six columns starting with 1 (Fig. 1). Then only the first and the fifth columns (no pun) contain primes because all numbers in the second, fourth, and sixth columns are divisible by 2, and those in the third column are divisible by 3. To eliminate the numbers divisible by 5 and 7 as well, a few 45 ◦ diagonals have to be drawn, as shown in Fig.

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