Preparation and measurement of three-qubit entanglement in a superconducting circuit

L. DiCarlo (), M. D. Reed, L. Sun, B. R. Johnson, J. M. Chow, J. M. Gambetta, L. Frunzio, S. M. Girvin, M. H. Devoret and R. J. Schoelkopf ()
Additional contact information
L. DiCarlo: Yale University
M. D. Reed: Yale University
L. Sun: Yale University
B. R. Johnson: Yale University
J. M. Chow: Yale University
J. M. Gambetta: University of Waterloo
L. Frunzio: Yale University
S. M. Girvin: Yale University
M. H. Devoret: Yale University
R. J. Schoelkopf: Yale University

Nature, 2010, vol. 467, issue 7315, 574-578

Abstract: Three-qubit solid-state entanglement realized Quantum entanglement, in which the states of two or more particles are inextricably linked, is a key requirement for quantum computation. In superconducting devices, two-qubit entangled states have been used to implement simple quantum algorithms. The availability of three-qubit states, which can be entangled in two fundamentally different ways (the GHZ and W states), would be a significant advance because they should make it possible to perform error correction and infer scalability to the higher numbers of qubits needed for a practical quantum-information-processing device. Two groups now report the generation of three-qubit entanglement. John Martinis and colleagues create and measure both GHZ and W-type states. Leonardo DiCarlo and colleagues generate the GHZ state and demonstrate the first step of basic quantum error correction by encoding a logical qubit into a manifold of GHZ-like states using a repetition code.

Date: 2010
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DOI: 10.1038/nature09416

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