Browse Definitions by Alphabet

Q format - Q (number) format is a fixed-point method of coding fractional and whole integers for processing by a computer’s CPU or a digital signal processor (DSP).
QR code (quick response code) - A QR code (quick response code) is a type of 2D bar code that provides easy access to information through a smartphone camera.
quad-core processor - A quad-core processor is a chip with four independent units called cores that read and execute central processing unit (CPU) instructions such as add, move data and branch.
quad-level cell NAND (QLC NAND) - Quad-level cell NAND (QLC NAND) is a form of NAND flash memory that can store up to 4 bits of data per memory cell.
quality control (QC) - Quality control (QC) is a procedure or set of procedures intended to ensure that a manufactured product or performed service adheres to a defined set of quality criteria or meets the requirements of the client or customer.
quality of service (QoS) - Quality of service (QOS) refers to any technology that manages data traffic to reduce packet loss, latency and jitter on a network.
quantum interference - Quantum interference is when subatomic particles interact with and influence themselves and other particles while in a probabilistic superposition state.
quantum internet - The quantum internet is a theoretical system of interconnected quantum computers that uses quantum signals to send information rather than radio waves.
quantum key distribution (QKD) - Quantum key distribution (QKD) is a secure communication method for exchanging encryption keys only known between shared parties.
quantum supremacy - Quantum supremacy is the experimental demonstration of a quantum computer's dominance and advantage over classical computers by performing calculations previously impossible at unmatched speeds.
query - A query is a question or a request for information expressed in a formal manner.
queue depth - Queue depth, in storage, is the number of pending input/output (I/O) requests that a storage resource can handle at any one time.
QWERTY keyboard - The QWERTY (pronounced KWEHR-tee) keyboard is the standard typewriter and computer keyboard in countries that use a Latin-based alphabet.
What are quantum coherence and decoherence? - Quantum coherence and decoherence are fundamental indications of how well a system of quantum objects -- atoms or other quantum particles -- maintains its relationships and how reliably the ongoing operation of that quantum system can be predicted over time.
What is a quality gate? - A quality gate is a milestone in an IT project that requires that predefined criteria be met before the project can proceed to the next phase.
What is a quantum circuit? Quantum vs. classical circuit - Quantum circuits are systems consisting of logic gates that operate on quantum bits (qubits) to process information and perform calculations based on principles of quantum mechanics.
What is a quantum engineer? - Quantum engineering is a technological field that focuses on the principles of quantum physics.
What is a quantum logic gate? - A quantum logic gate is a basic quantum device that operates on a small number of quantum bits or qubits.
What is a quantum processing unit (QPU)? - A quantum processing unit (QPU) is a hardware device that uses quantum mechanics -- such as superposition and entanglement-- to perform complex calculations on quantum information stored in quantum bits, or qubits.
What is a qubit (quantum bit)? - A qubit, short for quantum bit, is the basic unit of information in quantum computing and the counterpart to the bit, or binary digit, in classical computing.
What is Q-learning? - Q-learning is a machine learning approach that enables a model to iteratively learn and improve over time by taking the correct action.
What is QAM (quadrature amplitude modulation) and how does it work? - QAM (quadrature amplitude modulation) is a method of combining two amplitude modulation (AM) signals into a single channel.
What is Qlik? - Qlik is a software vendor specializing in data visualization, executive dashboards and self-service business intelligence products.
What is qualitative data? - Qualitative data is descriptive information that focuses on concepts and characteristics, rather than numbers and statistics.
What is quality assurance (QA)? - Quality assurance (QA) is any systematic process of determining whether a product or service meets specified requirements.
What is quality of experience (QoE or QoX)? - Quality of experience (QoE or QoX) is a measure of the overall level of a customer's satisfaction and experience with a product or service and the vendor that's providing that product or service.
What is quantum as a service? Definition and top providers - Quantum as a service (QaaS), or quantum computing as a service, is a cloud-based way for organizations to access quantum computing technologies and capabilities more affordably through a third-party provider.
What is quantum computing? How it works and examples - Quantum computing is an emerging area of computer science focused on building computers based on the principles of quantum theory to dramatically increase computation speeds.
What is quantum cryptography? - Quantum cryptography is a method of encryption that uses the naturally occurring properties of quantum mechanics to secure and transmit data.
What is quantum entanglement and how does it work? - Quantum entanglement is a foundational phenomenon in quantum mechanics where two or more particles become interconnected in such a way that the state of one particle instantly influences the state of the other, regardless of the distance separating them.
What is quantum error mitigation? - Quantum error mitigation is a process used to reduce the impact of errors in quantum computing.
What is quantum in physics and computing? - A quantum, the singular form of quanta, is the smallest discrete unit of any physical entity.
What is quantum machine learning? How it works - Quantum machine learning (QML), also called quantum-enhanced machine learning, blends the computing power of quantum systems with the increasing computing demands of evolving machine learning models.
What is quantum superposition? - Quantum superposition is the ability of a quantum system to act as if it is in multiple states at the same time until it is measured.
What is quantum technology? Use cases and future implications - Quantum technology is a field of physics dedicated to developing new and innovative technologies based on the principles of quantum mechanics.
What is quantum theory? - Quantum theory, or quantum mechanics, is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the subatomic level.
What is quishing (QR code phishing)? - QR code phishing, or 'quishing,' is a social engineering phishing attack that intentionally deceives its recipient into scanning a QR code, redirecting the person to a bogus website.