QIP

QIP is a three-letter abbreviation with multiple meanings, as described below:

QIP (complexity)

In computational complexity theory, the class QIP, which stands for Quantum Interactive Polynomial time, is the quantum computing analogue of the classical complexity class IP, which is the set of problems solvable by an interactive proof system with a polynomial-time verifier and one computationally unbounded prover. Informally, IP is the set of languages for which a computationally unbounded prover can convince a polynomial-time verifier to accept when the input is in the language (with high probability) and cannot convince the verifier to accept when the input is not in the language (again, with high probability). In other words, the prover and verifier may interact for polynomially many rounds, and if the input is in the language the verifier should accept with probability greater than 2/3, and if the input is not in the language, the verifier should be reject with probability greater than 2/3. In IP, the verifier is like a BPP machine. In QIP, the communication between the prover and verifier is quantum, and the verifier can perform quantum computation. In this case the verifier is like a BQP machine.

Quiet Internet Pager

QIP (/ˈkwɪp/; an acronym for Quiet Internet Pager) is a multiprotocol instant messaging client. It is a closed source freeware program originally developed by Ilgam Zyulkorneev. In 2008 it was bought by RosBusinessConsulting media group and named most popular RBC service in 2009.

Features

A Softpedia review of QIP 2006 mentioned its unique feature (at the time) of tabbed message windows—instead of a message window for each chat session, one window with several tabs is shown. Since this feature's introduction, ICQ Version 6.0 now includes this feature, as do the multi-service clients Pidgin, Miranda IM, and Trillian. Other features include integrated mail.ru e-mail client, and a wider range of emoticons. QIP presents no advertisements in the application windows; this is described as a security advantage.

Versions

QIP 2005

QIP 2005 is an alternative instant messaging client based on the OSCAR protocol. It has full support of ICQ and experimental support of AIM.

QIP 2005 does not properly support Unicode which causes issues when sending and receiving non-ASCII messages unless both users use QIP.