Bulletin of the American Physical Society

A Dual-species Trapped-ion System for Quantum Information Processing with $^{88}$Sr$^+$ and $^{133}$Ba$^+$.

Susanna Todaro, Jasmine Sinanan-Singh, Jules Stuart, Colin Bruzewicz, Gabriel Mintzer, Luke Qi, Roberto Gauna, Isaac L. Chuang, John Chiaverini, Jeremy Sage

Published Jun 2, 2020• 0 citations

OpenAlex

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Bulletin of the American Physical Society

A Dual-species Trapped-ion System for Quantum Information Processing with $^{88}$ Sr $^+$ and $^{133}$ Ba $^+$ .A Dual-species Trapped-ion System for Quantum Information Processing with $^{88}$Sr$^+$ and $^{133}$Ba$^+$.

Susanna Todaro, Jasmine Sinanan-Singh, Jules Stuart, Colin Bruzewicz, Gabriel Mintzer, Luke Qi, Roberto Gauna, Isaac L. Chuang, John Chiaverini, Jeremy Sage

Published Jun 2, 2020• 0 citations

OpenAlex

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Bulletin of the American Physical SocietyMay 28, 20190 citations

A dual-species trapped ion quantum simulator for studying quantum dynamics of large number of spins

Nikhil Kotibhaskar, Sainath Motlakunta, Chung-You Shih +5 more

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Colin Bruzewicz, Robert McConnell, Jules Stuart +2 more

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 $${}^{+}$$

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Xiaoyang Shi, Jasmine Sinanan-Singh, Kyle DeBry +3 more

Coherent storage of quantum information is crucial to many quantum technologies. Long coherence times have been demonstrated in trapped-ion qubits, typically using the hyperfine levels within the ground state of a single ion. However, recent research suggests qubits encoded in metastable states could provide architectural benefits for quantum information processing, such as the possibility of effective dual-species operation in a single-species system and erasure-error conversion for fault-tolerant quantum computing. Here we demonstrate long-lived encoding of a quantum state in the metastable states of a trapped ion. By sympathetically cooling with another ion of the same species and constantly monitoring for erasure errors, we demonstrate a coherence time of 136(42) seconds with a qubit encoded in the metastable $5D_{5/2}$ state of a single $^{137}$ Ba $^+$ ion. In agreement with a model based on empirical results from dynamical-decoupling-based noise spectroscopy, we find that dephasing of the metastable levels is the dominant source of error once erasure errors are removed.Coherent storage of quantum information is crucial to many quantum technologies. Long coherence times have been demonstrated in trapped-ion qubits, typically using the hyperfine levels within the ground state of a single ion. However, recent research suggests qubits encoded in metastable states could provide architectural benefits for quantum information processing, such as the possibility of effective dual-species operation in a single-species system and erasure-error conversion for fault-tolerant quantum computing. Here we demonstrate long-lived encoding of a quantum state in the metastable states of a trapped ion. By sympathetically cooling with another ion of the same species and constantly monitoring for erasure errors, we demonstrate a coherence time of 136(42) seconds with a qubit encoded in the metastable $5D_{5/2}$ state of a single $^{137}$Ba$^+$ ion. In agreement with a model based on empirical results from dynamical-decoupling-based noise spectroscopy, we find that dephasing of the metastable levels is the dominant source of error once erasure errors are removed.

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R. Blatt

Bulletin of the American Physical SocietyMar 14, 20060 citations

A Dual-species Trapped-ion System for Quantum Information Processing with

^{88}

^+

and

^{133}

^+

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

{}^{+}

The use of

{}^{133}

{}^+

as a new candidate for trapped atomic ion qubits

5D_{5/2}

state of a single

^{137}

^+

ion. In agreement with a model based on empirical results from dynamical-decoupling-based noise spectroscopy, we find that dephasing of the metastable levels is the dominant source of error once erasure errors are removed.