Physics:Quantum Qubit - Revision history

WikiHarold: Restore missing Quantum reference definitions

2026-05-24T00:31:26Z

Restore missing Quantum reference definitions

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	== Comparison with a classical bit ==		== Comparison with a classical bit ==

	A classical bit can take only one of two values, 0 or 1. A qubit, however, can exist in a coherent superposition of both basis states.<ref name="NielsenChuang2010" />		A classical bit can take only one of two values, 0 or 1. A qubit, however, can exist in a coherent superposition of both basis states.<ref name="NielsenChuang2010">{{cite book \|last1=Nielsen \|first1=Michael A. \|last2=Chuang \|first2=Isaac L. \|title=Quantum Computation and Quantum Information \|publisher=Cambridge University Press \|year=2010 \|isbn=978-1-107-00217-3}}</ref>

	Upon measurement:		Upon measurement:

Maintenance script: Normalize quantum page header order

2026-05-22T11:32:43Z

Normalize quantum page header order

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	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}
	{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}		{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}

	<div style="display:flex; gap:24px; align-items:flex-start; max-width:1200px;">		<div style="display:flex; gap:24px; align-items:flex-start; max-width:1200px;">

Maintenance script: Clean Book label remnants and backlink spacing

2026-05-22T11:11:03Z

Clean Book label remnants and backlink spacing

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	{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}
	{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}		{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}

Maintenance script: Remove hidden BOM characters and direct Book label after Short description

2026-05-22T11:03:15Z

Remove hidden BOM characters and direct Book label after Short description

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	{{Short description\|Quantum Collection topic on Quantum Qubit}}~~Book I~~		{{Short description\|Quantum Collection topic on Quantum Qubit}}

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}

Maintenance script: Clean Short description prefix and add Book I label

2026-05-22T10:48:17Z

Clean Short description prefix and add Book I label

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	~~~~{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}Book I

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}

Maintenance script: Apply Quantum previous-next navigation

2026-05-20T12:25:10Z

Apply Quantum previous-next navigation

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	{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}
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Maintenance script: Improve Book I intro quality

2026-05-20T09:04:12Z

Improve Book I intro quality

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	{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}
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	<div style="flex:1; line-height:1.45; color:#006b45; column-count:2; column-gap:32px; column-rule:1px solid #b8d8c8;">		<div style="flex:1; line-height:1.45; color:#006b45; column-count:2; column-gap:32px; column-rule:1px solid #b8d8c8;">
	'''Qubit''' is a ~~Book I topic in the Quantum Collection. A~~ qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A qubit ~~is described by a state vector~~ in a ~~two-dimensional complex Hilbert space with orthonormal~~ basis states ~~\|0\rangle and \|1\rangle~~. ~~where \alpha~~, ~~\beta \in \mathbb{C} satisfy~~ the ~~normalization condition The coefficients \alpha~~ and ~~\beta are probability amplitudes~~. ~~A classical bit~~ can ~~take only one~~ of ~~two values~~, ~~0 or 1~~.		'''Qubit''' a qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A classical bit can take only one of two values, 0 or 1. A qubit, however, can exist in a coherent superposition of both basis states. Unlike a classical bit, measurement generally disturbs the qubit state and destroys quantum coherence. Any pure qubit state can be written as Pure states lie on the surface of the Bloch sphere, while the global phase has no observable physical effect.
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Maintenance script: Clean Book I red links, intro, and image slots

2026-05-20T08:15:05Z

Clean Book I red links, intro, and image slots

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	{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}

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	A '''~~qubit~~''' (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit.~~<ref name="NielsenChuang2010">{{cite book \|last1=Nielsen \|first1=Michael~~ A. ~~\|last2=Chuang \|first2=Isaac L~~. \|~~title=Quantum Computation~~ and ~~Quantum Information~~ \|~~publisher=Cambridge University Press \|year=2010 \|isbn=978-~~1~~-107-00217-3~~}~~}</ref>~~		'''Qubit''' is a Book I topic in the Quantum Collection. A qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A qubit (quantum bit) is the fundamental unit of quantum information. It is realized by a two-level quantum system and forms the quantum analogue of the classical bit. A qubit is described by a state vector in a two-dimensional complex Hilbert space with orthonormal basis states \|0\rangle and \|1\rangle. where \alpha, \beta \in \mathbb{C} satisfy the normalization condition The coefficients \alpha and \beta are probability amplitudes. A classical bit can take only one of two values, 0 or 1.
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Maintenance script: Extend short Book I page text

2026-05-19T23:15:57Z

Extend short Book I page text

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	== Related measurements ==		== Related measurements ==
	Typical measurements involve spectra, decay products, transition rates, transport behavior, correlation functions, or detector signatures. These observations provide the empirical link between the page topic and the wider Quantum Collection.		Typical measurements involve spectra, decay products, transition rates, transport behavior, correlation functions, or detector signatures. These observations provide the empirical link between the page topic and the wider Quantum Collection.

			== Additional context ==
			A qubit is also the point where physical implementation and information theory meet. Real qubits must be initialized, controlled, measured, and protected from noise, so the abstract two-state model is normally paired with hardware-specific discussions of gates, coherence time, readout fidelity, and error correction.

	=See also=		=See also=

Maintenance script: Extend short Quantum book page text

2026-05-19T23:12:46Z

Extend short Quantum book page text

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	== Role in the collection ==		== Role in the collection ==
	This page provides a compact reference point for related pages in Book II. It should be read together with nearby matter-scale topics and the corresponding foundations in [[Physics:Quantum mechanics\|quantum mechanics]].<ref name="matter-wiki">{{cite web \|url=https://en.wikipedia.org/wiki/Quantum_mechanics \|title=Quantum mechanics \|website=Wikipedia \|access-date=2026-05-20}}</ref>		This page provides a compact reference point for related pages in Book II. It should be read together with nearby matter-scale topics and the corresponding foundations in [[Physics:Quantum mechanics\|quantum mechanics]].<ref name="matter-wiki">{{cite web \|url=https://en.wikipedia.org/wiki/Quantum_mechanics \|title=Quantum mechanics \|website=Wikipedia \|access-date=2026-05-20}}</ref>

			== Interpretation ==
			For qubit, the quantum description is useful because it separates the allowed states, interactions, and measurable quantities from the classical picture. The same concept may appear differently in spectroscopy, scattering, condensed matter, field theory, or cosmology.

			== Related measurements ==
			Typical measurements involve spectra, decay products, transition rates, transport behavior, correlation functions, or detector signatures. These observations provide the empirical link between the page topic and the wider Quantum Collection.

	=See also=		=See also=

← Older revision		Revision as of 11:11, 22 May 2026
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	{{Short description\|Quantum Collection topic on Quantum Qubit}}		{{Short description\|Quantum Collection topic on Quantum Qubit}}

	{{Quantum book backlink\|Quantum information and computing}}		{{Quantum book backlink\|Quantum information and computing}}
	{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}		{{Quantum article nav\|previous=Physics:Quantum information theory\|previous label=Information theory\|next=Physics:Quantum Entanglement\|next label=Entanglement}}