Abstract We demonstrate key multi-qubit quantum-logic primitives in a dual-species trapped-ion system based on $${}^{40}$$ 40 Ca $${}^{+}$$ + and $${}^{88}$$ 88 Sr $${}^{+}$$ + ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, cooling, and control wavelengths in a wavelength band similar for the two species and centered in the visible, and with a favorable mass ratio for sympathetic cooling, this pair is a promising candidate for scalable quantum information processing. Same-species and dual-species two-qubit gates, based on the Mølmer–Sørensen interaction and performed in a cryogenic surface-electrode trap, are characterized via the fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and 97.5(2)% in Ca $${}^{+}$$ + –Ca $${}^{+}$$ + and Sr $${}^{+}$$ + –Sr $${}^{+}$$ + gates, respectively. For a similar Ca $${}^{+}$$ + –Sr $${}^{+}$$ + gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr $${}^{+}$$ + –Sr $${}^{+}$$ + gate performed with a Ca $${}^{+}$$ + sympathetic cooling ion in a Sr $${}^{+}$$ + –Ca $${}^{+}$$

arXiv:1905.13122npj Quantum InformationNov 21, 201949 citations

Bulletin of the American Physical Society

Visible-Wavelength Multi-Species Trapped-Ion Quantum Logic

Colin Bruzewicz, Robert McConnell, Jonathon A. Sedlacek, Jules Stuart, John Chiaverini, Jeremy Sage

Published Jun 7, 2017• 0 citations

OpenAlex

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Abstract We demonstrate key multi-qubit quantum-logic primitives in a dual-species trapped-ion system based on ${}^{40}$ 40 Ca ${}^{+}$ + and ${}^{88}$ 88 Sr ${}^{+}$ + ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, cooling, and control wavelengths in a wavelength band similar for the two species and centered in the visible, and with a favorable mass ratio for sympathetic cooling, this pair is a promising candidate for scalable quantum information processing. Same-species and dual-species two-qubit gates, based on the Mølmer–Sørensen interaction and performed in a cryogenic surface-electrode trap, are characterized via the fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and 97.5(2)% in Ca ${}^{+}$ + –Ca ${}^{+}$ + and Sr ${}^{+}$ + –Sr ${}^{+}$ + gates, respectively. For a similar Ca ${}^{+}$ + –Sr ${}^{+}$ + gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr ${}^{+}$ + –Sr ${}^{+}$ + gate performed with a Ca ${}^{+}$ + sympathetic cooling ion in a Sr ${}^{+}$ + –Ca ${}^{+}$ Abstract We demonstrate key multi-qubit quantum-logic primitives in a dual-species trapped-ion system based on $${}^{40}$$ 40 Ca $${}^{+}$$ + and $${}^{88}$$ 88 Sr $${}^{+}$$ + ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, cooling, and control wavelengths in a wavelength band similar for the two species and centered in the visible, and with a favorable mass ratio for sympathetic cooling, this pair is a promising candidate for scalable quantum information processing. Same-species and dual-species two-qubit gates, based on the Mølmer–Sørensen interaction and performed in a cryogenic surface-electrode trap, are characterized via the fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and 97.5(2)% in Ca $${}^{+}$$ + –Ca $${}^{+}$$ + and Sr $${}^{+}$$ + –Sr $${}^{+}$$ + gates, respectively. For a similar Ca $${}^{+}$$ + –Sr $${}^{+}$$ + gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr $${}^{+}$$ + –Sr $${}^{+}$$ + gate performed with a Ca $${}^{+}$$ + sympathetic cooling ion in a Sr $${}^{+}$$ + –Ca $${}^{+}$$

arXiv:1905.13122npj Quantum InformationNov 21, 201949 citations

Abstract We demonstrate key multi-qubit quantum-logic primitives in a dual-species trapped-ion system based on

{}^{40}

40 Ca

{}^{+}

+ and

{}^{88}

88 Sr

{}^{+}

+ ions, using two optical qubits with quantum-logic-control frequencies in the red to near-infrared range. With all ionization, cooling, and control wavelengths in a wavelength band similar for the two species and centered in the visible, and with a favorable mass ratio for sympathetic cooling, this pair is a promising candidate for scalable quantum information processing. Same-species and dual-species two-qubit gates, based on the Mølmer–Sørensen interaction and performed in a cryogenic surface-electrode trap, are characterized via the fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and 97.5(2)% in Ca

{}^{+}

+ –Ca

{}^{+}

+ and Sr

{}^{+}

+ –Sr

{}^{+}

+ gates, respectively. For a similar Ca

{}^{+}

+ –Sr

{}^{+}

+ gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr

{}^{+}

+ –Sr

{}^{+}

+ gate performed with a Ca

{}^{+}

+ sympathetic cooling ion in a Sr

{}^{+}

+ –Ca

{}^{+}