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New functionality: Quantiki Video Abstracts

We are pleased to inform that Quantiki has a new functionality. We introduce Quantiki Video Abstracts - a place where you can upload video abstracts of your papers. If you want to promote your paper just make a short video in which you introduce it and upload it on Quantiki and share it with Quantum Information community. You can also subscribe YouTube channel with Quantiki video abstracts.

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	Portal for Quantum Information community where you can share information about recent events and news.
	Lists of groups and people working on quantum information theory.
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	List of the open problems in quantum information theory created by Reinhard Werner.
	The Handbook of Quantum Information which contains an encyclopaedia of everything on quantum information.
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	The Quantiki version of the European QIPC Roadmap and other documents delivered by the QUROPE Workpackage 2

Featured Article

A qubit is a quantum system in which the Boolean states $0$ and $1$ are represented by a prescribed pair of normalised and mutually orthogonal quantum states labeled as $\{|0\rangle ,|1\rangle \}$

The two states form a `computational basis' and any other (pure) state of the qubit can be written as a superposition $\alpha |0\rangle +\beta |1\rangle$ for some $α$ and $β$ such that $| α | 2 + | β | 2 = 1.$ A qubit is typically a microscopic system, such as an atom, a nuclear spin, or a polarised photon. A collection of $n$ qubits is called a quantum register of size $n$ .

We shall assume that information is stored in the registers in binary form. For example, the number $6$ is represented by a register in state $|1\rangle \otimes |1\rangle \otimes |0\rangle$ . In more compact notation: $|a\rangle$ stands for the tensor product $|a_{n-1}\rangle \otimes |a_{n-2}\rangle \ldots |a_{1}\rangle \otimes |a_{0}\rangle$ , where $a_i\in\{0,1\}$ , and it represents a quantum register prepared with the value $a=2^{0}a_{0}+2^{1}a_{1}+\ldots2^{n-1}a_{n-1}$ . There are $2 n$ states of this kind, representing all binary strings of length $n$ or numbers from $0$ to $2 n - 1$ , and they form a convenient computational basis. In the following $a\in \{0,1\}^n$ ( $a$ is a binary string of length $n$ ) implies that $\left| a \right\rangle$ belongs to the computational basis.