qubit

Blend of quantum + bit, a play on cubit (“historical unit of length”). Coined by American physicist Benjamin Schumacher in 1995.

coin

Coordinate term: bit

Quantum computing, on the other hand, is based on quantum bits, or qubits.

Each extra qubit in a quantum machine doubles the number of simultaneous operations it can perform.

2012 February 25, ‘An uncertain future’, The Economist:

Google’s Sycamore computer has all of 53 qubits to its name, as does a new IBM computer, installed online at the company’s Quantum Computation Center in Poughkeepsie, N.Y. System One, IBM’s black cube from tomorrow, only has 20 qubits.

2019 October 21, Dennis Overbye, “Quantum Computing Is Coming, Bit by Qubit”, in New York Times:

By harnessing that odd behavior, scientists can instead build a quantum bit, or qubit, which stores a combination of 1 and 0. Two qubits can hold four values at once. And as the number of qubits grows, a quantum computer becomes exponentially more powerful.

2019 October 23, Cade Metz, “Google Claims a Quantum Breakthrough That Could Change Computing”, in New York Times:

(quantum computing) A quantum bit; the basic unit of quantum information described by a superposition of two states; a quantum bit in a quantum computer capable of being in a state of superposition.


quantum

en-noun

quantum (countable and uncountable, plural quantums or quanta)

[ˈkʰwɑ̃ntʰə̃m]

[ˈkʰwɑ̃ɾ̃ə̃m]

From Late Latin quantum, noun use of neuter form of Latin quantus (“how much”).

Developing for quantum has never been more accessible.

quantum computing
quantum computing#English

(computing, uncountable) Short for quantum computing.


two-bit

(quantum computing, of a logic gate) Acting on, and producing, two qubits.


quantum computer

quantum computer (plural quantum computers)

LL-Q1860 (eng)-Flame, not lame-quantum computer.wav

Graphene could change the electronics industry, ushering in flexible devices, supercharged quantum computers, electronic clothing and computers that can interface with the cells in your body.

2014 April 13, Nick Bilton, “Bend it, charge it, dunk it: Graphene, the material of tomorrow”, in The New York Times:

(quantum computing) A computer that exploits quantum mechanical phenomena to transcend classical time complexity limitations.

量子計算機

computer that relies on quantum mechanical phenomena for speed


qutrit

(quantum computing) A quantum trit; the unit of quantum information described by a superposition of three states; a ternary qudit.


qubyte

Blend of quantum + byte, generalizing the prefix qu-, after qubit.

(quantum computing) A quantum byte, one composed of eight qubits.


multiqubit

en-adj

multiqubit (comparative more multiqubit, superlative most multiqubit)

more multiqubit (comparative)
most multiqubit (superlative)

(quantum computing) Involving multiple qubits


squbit

(quantum computing) A semiconducting qubit (as proposed for use in quantum computers)


fluxonium

(physics, electronics) A superconducting artificial atom modelled from Josephson junctions


transmon

Abbreviation of transmission line shunted plasma oscillation qubit.

Two additional transmon circuits can be positioned at the resonator edges, where the resonator voltage is maximum.

2019, Thi Ha Kyaw, Towards a Scalable Quantum Computing Platform in the Ultrastrong Coupling Regime, Springer, →ISBN, page 93:

Those bits are then converted into pulses of microwaves and sent down through wires and pipes to a series of 50 small superconducting devices called “transmons” — the qubits — dangling at the bottom.

(physics) A particular form of superconducting qubit.


qudit

Blend of quantum + dit. Compare qubit, qutrit.

(quantum computing) A quantum dit; the unit of quantum information described by a superposition of d states, where the number of states is an integer greater than two.


qugate

The time required for the operation of a qugate is usually referred to as gate time or τ_(gate), and it should also be much shorter than the decoherence time of each qubit.

2015, Richard A. Layfield, Muralee Murugesu, Lanthanides and Actinides in Molecular Magnetism, page 189:

(computing) The kind of logic gate used in quantum computing.


qumix

(quantum computing) A mixed state in a quantum computing system.


quregister

In these logics formulas are supposed to denote pieces of quantum information (qubits, quregisters or mixtures of quregisters), while logical connectives correspond to (quantum logical) gates that transform quantum information in a reversible way.

2016, Maria Luisa Dalla Chiara, Roberto Giuntini, Roberto Leporini, Giuseppe Sergioli, “Holistic logical arguments in quantum computation”, in arXiv:

(quantum computing) The equivalent of a register in a quantum computing system.


量子位元

ㄌㄧㄤˋ ㄗˇ ㄨㄟˋ ㄩㄢˊ

лянцзы вэйюань

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ weɪ̯⁵¹ ɥɛn³⁵/

/lœːŋ²² t͡siː³⁵ wɐi̯²² jyːn²¹/

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ weɪ̯⁵¹ ɥɛn³⁵/

/lœːŋ²² t͡siː³⁵ wɐi̯²² jyːn²¹/

(Hong Kong, Taiwan, quantum computing) qubit


ebit

(physics, computing) An entangled bit (in a quantum computer)


quantum supremacy

Coined by American theoretical physicist John Preskill in 2012.

coin

Google said on Wednesday that it had achieved a long-sought breakthrough called “quantum supremacy,” which could allow new kinds of computers to do calculations at speeds that are inconceivable with today’s technology.

The potential ability of quantum computers to solve problems that are intractable for classical computers.


Bloch sphere

Named after Swiss-American physicist Felix Bloch (1905–1983).

named-after

(quantum mechanics) A geometrical representation of the pure state space of a two-level quantum-mechanical system, or qubit.


量子電腦

ㄌㄧㄤˋ ㄗˇ ㄉㄧㄢˋ ㄋㄠˇ

лянцзы дяньнао

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ ti̯ɛn⁵¹ nɑʊ̯²¹⁴⁻²¹⁽⁴⁾/


量子計算機

ㄌㄧㄤˋ ㄗˇ ㄐㄧˋ ㄙㄨㄢˋ ㄐㄧ

лянцзы цзисуаньцзи

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ t͡ɕi⁵¹⁻⁵³ su̯än⁵¹ t͡ɕi⁵⁵/


QRAM

random access memory
random access memory#English

(quantum computing) Initialism of quantum random access memory.


QCU

(quantum computing) Initialism of quantum control unit.


QPU

We find that the performance of both approaches is likely to depend on the quantum interconnect that serves to entangle multiple QPUs.

2017 March 17, Keith A. Britt, Travis S. Humble, “High-Performance Computing with Quantum Processing Units”, in ACM Journal on Emerging Technologies in Computing Systems, volume 13, number 3, →DOI, →ISSN, pages 39:1–39:13:

quantum processing unit
quantum processing unit#English

(quantum computing) Initialism of quantum processing unit.


quantum processing unit

en-noun

quantum processing unit (plural quantum processing units)

(quantum computing) A computational unit that uses quantum computing principles to perform a task.


quantum register

quantum register (plural quantum registers)

(quantum computing) A collection of qubits on which quantum gates act.


triqubit

The Deutsch gate is then indeed universal within the triqubit world.

2008, Zdzislaw Meglicki, Quantum Computing Without Magic: Devices, MIT Press, →ISBN, page 320:

(quantum computing) Involving three qubits.


quantum gate

(quantum computing) A basic quantum circuit operating on a small number of qubits.


quantum logic gate

quantum logic gate (plural quantum logic gates)

So far, experimenters have managed to make single quantum logic gates. Factoring a 300-digit number would require stringing together thousands of gates, and even quantum computing's most enthusiastic supporters admit that such a goal is exceedingly daunting.

1997 February 18, George Johnson, “Quantum Theorists Trying to Surpass Digital Computing”, in The New York Times, →ISSN:

(quantum computing) Synonym of quantum gate


Deutsch gate

Named after British physicist David Deutsch.

named-after

(quantum computing) A three-qubit quantum gate.


NISQ

Coined by physicist John Preskill in 2018 (see quotations below).

coin

For this talk, I needed a name to describe this impending new era, so I made up a word: NISQ. This stands for Noisy Intermediate-Scale Quantum.

[2018, John Preskill, “Quantum Computing in the NISQ era and beyond”, in Quantum, volume 2, page 82:

The quantum computing era that we are living in today is known as the NISQ era, as mentioned in the previous section.

2021, Srinjoy Ganguly, Thomas Cambier, Quantum Computing with Silq Programming, Packt Publishing Ltd, →ISBN, page 86:

Initially, Google would be focusing on so-called "noisy intermediate-scale quantum" (NISQ) algorithms, he said. NISQ is the low-hanging fruit of quantum computing that scientists hope will make the technology useful this decade.

2022 July 28, “Google seeks quantum gains in Aussie labs”, in The Australian Financial Review, Melbourne, page 3:

To my knowledge, this is the first piece of work to demonstrate quantum benefit using a NISQ machine to solve militarily important problems and that will build confidence and underpin continued investment in quantum information processing by the UK MOD and Government.

2023 January 13, “United Kingdom: Making better, faster decisions with quantum computing”, in Asia News Monitor, Bangkok:

(quantum computing, attributive, neologism) Acronym of noisy intermediate-scale quantum (computer).


квантовий комп'ютер

uk-noun

ква́нтовий<+> комп'ю́тер<>

ква́нтовий комп'ю́тер • (kvántovyj kompʺjúter) m inan (genitive ква́нтового комп'ю́тера, nominative plural ква́нтові комп'ю́тери, genitive plural ква́нтових комп'ю́терів)

ква́нтовий комп'ю́тер (canonical)
kvántovyj kompʺjúter (romanization)
ква́нтового комп'ю́тера (genitive)
ква́нтові комп'ю́тери (nominative plural)
ква́нтових комп'ю́терів (genitive plural)
ква́нтовий комп'ю́тер (nominative singular)
ква́нтові комп'ю́тери (nominative plural)
ква́нтового комп'ю́тера (genitive singular)
ква́нтових комп'ю́терів (genitive plural)
ква́нтовому комп'ю́терові (dative singular)
ква́нтовому комп'ю́теру (dative singular)
ква́нтовим комп'ю́терам (dative plural)
ква́нтовий комп'ю́тер (accusative singular)
ква́нтові комп'ю́тери (accusative plural)
ква́нтовим комп'ю́тером (instrumental singular)
ква́нтовими комп'ю́терами (instrumental plural)
ква́нтовому комп'ю́тері (locative singular)
ква́нтовім комп'ю́тері (locative singular)
ква́нтових комп'ю́терах (locative plural)
ква́нтовий комп'ю́тере (singular vocative)
ква́нтові комп'ю́тери (plural vocative)

uk-ndecl

ква́нтовий<+> комп'ю́тер<>


TIQIP

(quantum computing) Acronym of trapped-ion quantum information processor.


量子比特

ㄌㄧㄤˋ ㄗˇ ㄅㄧˇ ㄊㄜˋ

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻³⁵ pi²¹⁴⁻²¹ tʰɤ⁵¹/

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻³⁵ pi²¹⁴⁻²¹ tʰɤ⁵¹/

(Mainland China, quantum computing) qubit


量子計算

ㄌㄧㄤˋ ㄗˇ ㄐㄧˋ ㄙㄨㄢˋ

лянцзы цзисуань

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ t͡ɕi⁵¹⁻⁵³ su̯än⁵¹/

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ t͡ɕi⁵¹⁻⁵³ su̯än⁵¹/


量子門

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ mən³⁵/

/li̯ɑŋ⁵¹ t͡sz̩²¹⁴⁻²¹ mən³⁵/


LOCC

(quantum information) Abbreviation of local operations and classical communication.


Gottesman-Knill theorem

Named after Daniel Gottesman and Emanuel Knill.

(quantum computing) A result that states that stabilizer circuits (those consisting only of gates from the normalizer of the qubit Pauli group, or Clifford group) can be perfectly simulated in polynomial time on a probabilistic classical computer.