Glossary - Q

Quality of Experience -QoE

A measure of the overall level of customer satisfaction with a vendor or services.

Quality of Service - QoS

It refers to the network parameter settings configured by service providers to deliver various service-level offerings to their customers.

Quadrature Phase Shift Keying - QPSK

A form of Phase Shift Keying where two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK enables the signal to carry twice as much information as ordinary PSK using the same bandwidth.

Quatum bit - qubit

The basic unit of information in quantum computing. A qubit uses the quantum mechanical phenomena of superposition to achieve a linear combination of two states. A classical binary bit can only represent a single binary value, such as 0 or 1, meaning that it can only be in one of two possible states. A qubit, however, can represent a 0, a 1, or any proportion of 0 and 1 in superposition of both states, with a certain probability of being a 0 and a certain probability of being a 1.