High-fidelity entanglement ofCa+43hyperfine clock states
| Autor: | Rene Gerritsma, F. Zähringer, J. Benhelm, Gerhard Kirchmair, C. Roos, Rainer Blatt |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Bell state Charge qubit Quantum Physics Quantum entanglement 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Phase qubit Computer Science::Emerging Technologies Qubit Quantum mechanics 0103 physical sciences Quantum information 010306 general physics Ground state Hyperfine structure |
| Zdroj: | Physical Review A. 79 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.79.020304 |
| Popis: | In an experiment using the odd calcium isotope $^{43}\mathrm{Ca}^{+}$, we combine the merits of a high-fidelity entangling operation on an optical transition (optical qubit) with the long coherence times of two ``clock'' states in the hyperfine ground state (hyperfine qubit) by mapping between these two qubits. For state initialization, state detection, global qubit rotations, and mapping operations, errors smaller than 1% are achieved, whereas the entangling gate adds errors of 2.3%. Based on these operations, we create Bell states with a fidelity of 96.9(3)% in the optical qubit and a fidelity of 96.7(3)% when mapped to the hyperfine states. In the latter case, the entanglement is preserved for $96(3)\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$, exceeding the duration of a single gate operation by three orders of magnitude. |
| Databáze: | OpenAIRE |
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