About: Charge qubit

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In quantum computing, a charge qubit (also known as Cooper-pair box) is a qubit whose basis states are charge states (i.e. states which represent the presence or absence of excess Cooper pairs in the island). In superconducting quantum computing, a charge qubit is formed by a tiny superconducting island coupled by a Josephson junction (or practically, superconducting tunnel junction) to a superconducting reservoir (see figure). The state of the qubit is determined by the number of Cooper pairs which have tunneled across the junction. In contrast with the charge state of an atomic or molecular ion, the charge states of such an "island" involve a macroscopic number of conduction electrons of the island. The quantum superposition of charge states can be achieved by tuning the gate voltage U t

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rdfs:label	Charge qubit (en)
rdfs:comment	In quantum computing, a charge qubit (also known as Cooper-pair box) is a qubit whose basis states are charge states (i.e. states which represent the presence or absence of excess Cooper pairs in the island). In superconducting quantum computing, a charge qubit is formed by a tiny superconducting island coupled by a Josephson junction (or practically, superconducting tunnel junction) to a superconducting reservoir (see figure). The state of the qubit is determined by the number of Cooper pairs which have tunneled across the junction. In contrast with the charge state of an atomic or molecular ion, the charge states of such an "island" involve a macroscopic number of conduction electrons of the island. The quantum superposition of charge states can be achieved by tuning the gate voltage U t (en)
foaf:depiction
dct:subject	Quantum information science Superconductivity Quantum electronics
Wikipage page ID	977983 (xsd:integer)
Wikipage revision ID	1088024154 (xsd:integer)
Link from a Wikipage to another Wikipage	Quantum state Qubit Electric charge Quantum computing Quantum decoherence Electrometer Cooper pair Shor's algorithm Michel Devoret Microelectronics Aluminum oxide Quantum information science Ion trap Superconductivity Photolithography Quantum electronics Vincent Bouchiat Nuclear magnetic resonance Superconducting tunnel junction Single-electron transistor Niemeyer–Dolan technique Phase qubit Solid-state physics Superconducting quantum computing Transmon Robert J. Schoelkopf Superconductor Electron beam lithography Josephson junction Spin-spin relaxation Radio-frequency Steven M. Girvin
sameAs	Charge qubit Charge qubit Charge qubit
dbp:wikiPageUsesTemplate	dbt:Reflist dbt:Short_description dbt:Quantum_computing
thumbnail	wiki-commons:Special:FilePath/Cooper_pair_box_circuit.png?width=300
has abstract	In quantum computing, a charge qubit (also known as Cooper-pair box) is a qubit whose basis states are charge states (i.e. states which represent the presence or absence of excess Cooper pairs in the island). In superconducting quantum computing, a charge qubit is formed by a tiny superconducting island coupled by a Josephson junction (or practically, superconducting tunnel junction) to a superconducting reservoir (see figure). The state of the qubit is determined by the number of Cooper pairs which have tunneled across the junction. In contrast with the charge state of an atomic or molecular ion, the charge states of such an "island" involve a macroscopic number of conduction electrons of the island. The quantum superposition of charge states can be achieved by tuning the gate voltage U that controls the chemical potential of the island. The charge qubit is typically read-out by electrostatically coupling the island to an extremely sensitive electrometer such as the radio-frequency single-electron transistor. Typical T2 coherence times for a charge qubit are on the order of 1–2 μs. Recent work has shown T2 times approaching 100 μs using a type of charge qubit known as a transmon inside a three-dimensional superconducting cavity. Understanding the limits of T2 is an active area of research in the field of superconducting quantum computing. (en)
gold:hypernym	Qubit
prov:wasDerivedFrom	wikipedia-en:Charge_qubit?oldid=1088024154&ns=0
page length (characters) of wiki page	11514 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Charge_qubit
is Link from a Wikipage to another Wikipage of	Qubit Cooper-pair box Cooper Box Cooper pair box Index of physics articles (C) Flux qubit Yasunobu Nakamura Circuit quantum electrodynamics Vincent Bouchiat Superconducting tunnel junction Two-state quantum system Phase qubit Superconducting quantum computing Transmon Superconducting computing
is Wikipage redirect of	Cooper-pair box Cooper Box Cooper pair box
is foaf:primaryTopic of	wikipedia-en:Charge_qubit

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