Preparation of macroscopic quantum superposition states of a cavity field via coupling to a superconducting charge qubit

Journal Article · Wed Jun 15 00:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.063820· OSTI ID:20717981

Yuxi, Liu ^[1]; Wei, L F ^[1]; Nori, Franco ^[1]

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1. Frontier Research System, Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198 (Japan)

We propose how to generate macroscopic quantum superposition states using a microwave cavity containing a superconducting charge qubit. Based on the measurement of charge states, we show that the superpositions of two macroscopically distinguishable coherent states of a single-mode cavity field can be generated by a controllable interaction between a cavity field and a charge qubit. After such superpositions of the cavity field are created, the interaction can be switched off by the classical magnetic field, and there is no information transfer between the cavity field and the charge qubit. We also discuss the generation of the superpositions of two squeezed coherent states.

• OSTI ID: 20717981
• Journal Information: Physical Review. A, Vol. 71, Issue 6; Other Information: DOI: 10.1103/PhysRevA.71.063820; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION OPERATORS
CHARGE STATES
COUPLING
EIGENSTATES
MAGNETIC FIELDS
MICROWAVE RADIATION
QUANTUM MECHANICS
QUBITS
SQUID DEVICES