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Quadrature phase-shift keying
Quadrature phase-shift keying (QPSK) is a digital modulation scheme that encodes two bits per symbol using four carrier phases, doubling the spectral efficiency of BPSK.
Quadrature spatial modulation
Quadrature spatial modulation (QSM) is a MIMO transmission technique that sends the real and imaginary parts of a data symbol from separately chosen antennas, proposed in 2013.
Quadrics
Quadrics was a British company based in Bristol that made the QsNet high-performance interconnect used in TOP500 supercomputers such as ASCI Q before closing in 2009.
Quadro
Quadro was NVIDIA's brand of professional workstation graphics cards, launched in November 1999 and sold for more than 20 years before the line was rebranded as NVIDIA RTX.
Quadruplex telegraph
The quadruplex telegraph, also called the quadruplex system, is a telegraph system that sends four messages at once over a single wire, two in each direction.
Quadtree
A quadtree, or quadtree decomposition, is a tree data structure in which each node has four children, one per quadrant, used for spatial indexing and image encoding.
Quaise Energy
Quaise Energy is an American energy company spun out of MIT in 2018 that is developing millimeter wave drilling to reach superhot geothermal resources deeper than mechanical drills can go.
Quaker State (motor oil)
Quaker State is an American brand of motor oil and automotive lubricants, founded by Pennsylvania crude oil producers, merged with Pennzoil in 1998, and owned by Shell since 2002.
Qualcomm
Qualcomm Incorporated is an American semiconductor and telecommunications company headquartered in San Diego, California. Founded in 1985, it develops wireless technologies, sells Snapdragon chipsets, and licenses cellular patents.
Qualcomm AI data-center accelerators
Qualcomm's AI data-center accelerators, the AI200 and AI250, are rack-scale inference systems announced in October 2025, built around unusually large low-power DRAM rather than high-bandwidth memory.
Qualcomm Dragonwing
Qualcomm Dragonwing is a brand of Qualcomm Technologies processors and solutions for industrial and embedded Internet of Things applications, covering on-device AI, computing, and connectivity, introduced in February 2025.
Qualcomm Hexagon
Qualcomm Hexagon is a family of digital signal processors and neural processing units designed by Qualcomm Technologies, first launched in Snapdragon platforms in 2007 after development began in 2004.
Qualcomm Snapdragon
Qualcomm Snapdragon is a family of system-on-a-chip mobile platforms made by Qualcomm since 2007, integrating CPU, GPU, NPU, and modem on one chip to power smartphones, laptops, and vehicles.
Qualitative reasoning
Qualitative reasoning is a family of artificial intelligence methods that predicts the behavior of physical systems using signs and ordinal values instead of precise numbers.
Quality assurance
Quality assurance (QA) is the part of quality management that provides confidence quality requirements will be fulfilled, internal or external, through audits, inspection, and standards such as ISO 9001.
Quality cost
Quality cost, also called cost of quality (COQ), is a methodology measuring resources spent on preventing poor quality, appraising quality, and handling internal and external failures.
Quality filtering of web corpora
Quality filtering of web corpora is a set of methods developed since 2019 to score documents from web-scale collections, using three families such as heuristic rules or learned classifiers.
Quality of service
Quality of service (QoS) is the prioritization of network traffic so that delay- and loss-sensitive applications like voice and video are forwarded as they require.
Quality Record Pressings
Quality Record Pressings is a vinyl record pressing plant in Salina, Kansas, founded in 2011 by Chad Kassem of Acoustic Sounds, pressing about 1.5 million audiophile records a year.
Qualtrics
Qualtrics is an American experience management software company in Provo, Utah, founded in 2002, acquired by SAP for $8 billion, taken public in 2021, and taken private in 2023.
Qualys
Qualys is an American cloud-based security company, founded in 1999 and headquartered in Foster City, California, that provides vulnerability management and compliance software as a service.
Quang Ninh power station
Quang Ninh power station (Nhà máy Nhiệt điện Quảng Ninh) is a 1,200 MW coal-fired power station in Hạ Long City, Quảng Ninh province, Vietnam, operating since 2009.
Quanta Computer (广达电脑)
Quanta Computer (广达电脑) is a Taiwanese manufacturer of notebook computers and AI servers, founded in 1988 and headquartered in Taoyuan. It is the world's largest notebook maker.
Quantinuum
Quantinuum is an American quantum computing company formed in 2021 from Honeywell Quantum Solutions and Cambridge Quantum, headquartered in Broomfield, Colorado, and traded on Nasdaq as QNT.
Quantitative risk assessment
Quantitative risk assessment, also called quantitative risk analysis or probabilistic risk assessment in the nuclear field, numerically estimates the frequency and extent of harm from an activity against risk criteria.
Quantity surveying
Quantity surveying is the construction profession concerned with measuring building work and managing costs, practiced by quantity surveyors on behalf of contractors and building owners.
Quantity surveyor
A quantity surveyor (QS) is a construction professional who manages the costs and contracts of building projects, from feasibility estimates through tendering and construction to the final account.
Quantization (LLM inference)
Quantization in LLM inference maps a model's weights and activations from 16-bit floating point to 8-bit or 4-bit integers, so the model uses less memory and runs faster.
Quantization (machine learning)
Quantization in machine learning represents a neural network's weights, activations, and caches in lower-precision formats such as 8-bit or 4-bit integers, shrinking memory use and speeding up inference.
Quantization-aware large model inference
Quantization-aware large model inference runs large language models with weights at 8-bit or 4-bit precision, cutting memory and cost while keeping accuracy close to full precision.