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Cooper-pair Box
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 that 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-frequ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooper Pair Box Circuit
Cooper, Cooper's, Coopers and similar may refer to: * Cooper (profession), a maker of wooden casks and other staved vessels Arts and entertainment * Cooper (producers), an alias of Dutch producers Klubbheads * "Cooper", a song by Roxette from the 1999 album '' Have a Nice Day'' * Cooper Prize, an international playwriting prize based in Melbourne, Australia, since 2024 Businesses and organisations * Cooper (company), an American user experience design and business strategy consulting firm * Cooper (motorcycles), an American brand of motorcycles * Cooper Canada, a defunct sporting goods manufacturer * Cooper Car Company, a British car company **Mini Cooper, the name of several cars * Cooper Chemical Company, an American chemical manufacturer * The Cooper Companies, an American medical device company * Cooper Do-nuts, Los Angeles cafe which was the site of alleged uprising in reaction to police harassment of LGBT people * Cooper Enterprises, a Canadian boat builder ** Coop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phase Qubit
In quantum computing, and more specifically in superconducting quantum computing, the phase qubit is a superconducting device based on the superconductor–insulator–superconductor (SIS) Josephson junction, designed to operate as a quantum bit, or qubit. The phase qubit is closely related, yet distinct from, the flux qubit and the charge qubit, which are also quantum bits implemented by superconducting devices. The major distinction among the three is the ratio of Josephson energy vs Charge qubit#Hamiltonian, charging energy (the necessary energy for one Cooper pair to ''charge'' the total capacitance in the circuit): * For phase qubit, this ratio is on the order of 106, which allows for macroscopic bias current through the junction; * For flux qubit it's on the order of 10, which allows for Mesoscopic physics, mesoscopic supercurrents (typically ~300 nA [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michel Devoret
Michel Devoret is a French physicist and F. W. Beinecke Professor of Applied Physics at Yale University. He also holds a position as the Director of the Applied Physics Nanofabrication Lab at Yale. He is known for his pioneering work on macroscopic quantum tunneling, and the single-electron pump as well as in groundbreaking contributions to initiating the fields of circuit quantum electrodynamics and quantronics. Biography Devoret was born in France. He graduated from Ecole Nationale Superieure des Telecommunications in Paris (1975) and went on to earn his PhD in physics from the University of Orsay (University of Paris-Sud) in 1982, while working in the molecular quantum physics group at Paris. After his doctoral work, he proceeded to post-doctoral training for two years, working on macroscopic quantum tunneling in John Clarke's laboratory at the University of California Berkeley. Devoret's research has been focused on experimental solid state physics and condensed matter phys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert J
The name Robert is an ancient Germanic given name, from Proto-Germanic "fame" and "bright" (''Hrōþiberhtaz''). Compare Old Dutch ''Robrecht'' and Old High German ''Hrodebert'' (a compound of '' Hruod'' () "fame, glory, honour, praise, renown, godlike" and ''berht'' "bright, light, shining"). It is the second most frequently used given name of ancient Germanic origin.Reaney & Wilson, 1997. ''Dictionary of English Surnames''. Oxford University Press. It is also in use as a surname. Another commonly used form of the name is Rupert. After becoming widely used in Continental Europe, the name entered England in its Old French form ''Robert'', where an Old English cognate form (''Hrēodbēorht'', ''Hrodberht'', ''Hrēodbēorð'', ''Hrœdbœrð'', ''Hrœdberð'', ''Hrōðberχtŕ'') had existed before the Norman Conquest. The feminine version is Roberta. The Italian, Portuguese, and Spanish form is Roberto. Robert is also a common name in many Germanic languages, including En ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmon
In quantum computing, and more specifically in superconducting quantum computing, a transmon is a type of Superconductivity, superconducting charge qubit designed to have reduced sensitivity to charge noise. The transmon was developed by Jens Koch, Terri M. Yu, Jay Gambetta, Andrew Houck, David Schuster, Johannes Majer, Alexandre Blais, Michel Devoret, Steven M. Girvin, and Robert J. Schoelkopf at Yale University and Université de Sherbrooke in 2007. Its name is an abbreviation of the term ''transmission line shunted plasma oscillation qubit''; one which consists of a Cooper-pair box "where the two superconductors are also [capacitively] shunted in order to decrease the sensitivity to charge noise, while maintaining a sufficient anharmonicity for selective qubit control". The transmon achieves its reduced sensitivity to charge noise by significantly increasing the ratio of the Josephson energy to the charging energy. This is accomplished through the use of a large shunting capaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
