Superconducting qubit as a quantum transformer routing entanglement between a microscopic quantum memory and a macroscopic resonator

Journal Article · Thu Sep 01 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.84.104505· OSTI ID:21596864

Kemp, Alexander; Saito, Shiro; Semba, Kouichi ^[1]; Munro, William J ^[1]; Nemoto, Kae ^[2]

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1. NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi-shi, Kanagawa 243-0198 (Japan)
2. National Institute of Informatics 2-1-2 Hitotsubashi, Chiyoda ku, Tokyo 101-8430 (Japan)

We demonstrate experimentally the creation and measurement of an entangled state between a microscopic two-level system (TLS), formed by a defect in an oxide layer, and a macroscopic superconducting resonator, where their indirect interaction is mediated by an artificial atom, a superconducting persistent current qubit (PCQB). Under appropriate conditions, we found the coherence time of the TLS, the resonator, and the entangled state of these two are significantly longer than the Ramsey dephasing time of PCQB itself. This demonstrates that a PCQB can be used as a quantum transformer to address high coherence microscopic quantum memories by connecting them to macroscopic quantum buses.

• OSTI ID: 21596864
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 84, Issue 10; Other Information: DOI: 10.1103/PhysRevB.84.104505; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
DEFECTS
INTERACTIONS
LAYERS
OXIDES
QUANTUM ENTANGLEMENT
RESONATORS
ROUTING
TRANSFORMERS
CHALCOGENIDES
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
OXYGEN COMPOUNDS