Page Discussion View source History

Main Page

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.

Categories

	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.
	Introductory tutorials with basic introduction to key concepts in quantum theory.
	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.
	Resources for the quantum information community which include events, jobs, the history of the field and links to quantum blogs.
	The Quantiki version of the European QIST Roadmap and other documents delivered by the ERA-Pilot QIST Workpackage 1

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.