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Characterization of Two-Qubit Quantum Gates in a Scalable Surface Ion Trap.

Peter Maunz

Published Nov 9, 2017• 0 citations
OpenAlex

Abstract

Process fidelity of two-qubit Mølmer-Sørensen gate > 99.5% 95% confidence intervalsThe best characterized two qubit gate By the way: It's in a scalable surface trap

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Realization of Robust High-Fidelity Gates for Single-Ion Qubits in a Surface Trap.

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Single--ion qubits confined to microfabricated surface traps boast numerous advantages for a scalable quantum computer.The flexibility of modern chip traps supports a variety of exo>c trapping geometries and unprecedented control over individual qubits.Since their incep>on, the viability of chip traps has been met with skep>cism owing to the fact that hea>ng rates would presumably be dominated by surface interac>ons, which play a larger role as a result of the trap's close proximity to the ions.In order to debunk this misconcep>on, we report on the realiza>on of high--fidelity quantum informa>on processing protocols in Sandia's High--Op>cal--Access (HOA) surface trap.Through a number of technical improvements, such as driK control of classical control parameters and our development of a novel "gapless" pulse technique, we have achieved single--qubit gate fideli>es, both laser--and microwave--based, comparable to those found in the best--of--breed electrode traps.Gate Set Tomography (GST) provides an extremely accurate characteriza>on of our gates, including concrete measurements of diamond norm distances.We also demonstrate a realiza>on of the Mølmer--Sørensen two--qubit gate that is stable for several hours.By virtue of this stability, we've performed the first GST measurements in a qutrit basis, which have yielded a two--qubit process fidelity of 99.58( 6)%.Microfabricated Traps at Sandia High Op>cal Access Trap (HOA--2) Single--Qubit Gates Two--Qubit Gate Gate Set Tomography 0 1 0.2 0.

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High-fidelity quantum and classical control in microfabricated surface ion traps

Daniel Lobser

Trapped ions are among the top candidates for realizing high fidelity gate operations for quantum computation as well as other applications including quantum simulation and sensing [1]. However, scaling these systems up to the number of qubits required to solve interesting problems with conventional macroscopic traps quickly becomes intractable. To overcome the scalability challenge, advanced microfabrication techniques have been developed to support a variety of complex electrode layouts, allowing for precise and dynamic control of confining potentials. Using Sandia’s microfabricated surface ion traps, which feature low heating rates, high trap frequencies, and long trapping times, we demonstrate novel classical control techniques that employ parametric voltage solutions for elegant composition of shuttling operations and accurate control over the curvature of the confining potential. To demonstrate the viability of Sandia's microfabricated ion traps for quantum information processing, we’ve realized of high-fidelity single-qubit gates below a rigorous fault tolerance threshold for general noise [2,3] and two-qubit Mølmer-Sørensen gates with a process fidelity of 99.58(6)%.

Photonics for Quantum (PfQ)•Aug 27, 2021•0 citations
Abstract We demonstrate key multi-qubit quantum-logic primitives in a dual-species trapped-ion system based on 40{}^{40}40 40 Ca +{}^{+}+ + and 88{}^{88}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 +{}^{+}+
Single--ion qubits confined to microfabricated surface traps boast numerous advantages for a scalable quantum computer.The flexibility of modern chip traps supports a variety of exo>c trapping geometries and unprecedented control over individual qubits.Since their incep>on, the viability of chip traps has been met with skep>cism owing to the fact that hea>ng rates would presumably be dominated by surface interac>ons, which play a larger role as a result of the trap's close proximity to the ions.In order to debunk this misconcep>on, we report on the realiza>on of high--fidelity quantum informa>on processing protocols in Sandia's High--Op>cal--Access (HOA) surface trap.Through a number of technical improvements, such as driK control of classical control parameters and our development of a novel "gapless" pulse technique, we have achieved single--qubit gate fideli>es, both laser--and microwave--based, comparable to those found in the best--of--breed electrode traps.Gate Set Tomography (GST) provides an extremely accurate characteriza>on of our gates, including concrete measurements of diamond norm distances.We also demonstrate a realiza>on of the Mølmer--Sørensen two--qubit gate that is stable for several hours.By virtue of this stability, we've performed the first GST measurements in a qutrit basis, which have yielded a two--qubit process fidelity of 99.58( 6)%.Microfabricated Traps at Sandia High Op>cal Access Trap (HOA--2) Single--Qubit Gates Two--Qubit Gate Gate Set Tomography 0 1 0.2 0.
Trapped ions are among the top candidates for realizing high fidelity gate operations for quantum computation as well as other applications including quantum simulation and sensing [1]. However, scaling these systems up to the number of qubits required to solve interesting problems with conventional macroscopic traps quickly becomes intractable. To overcome the scalability challenge, advanced microfabrication techniques have been developed to support a variety of complex electrode layouts, allowing for precise and dynamic control of confining potentials. Using Sandia’s microfabricated surface ion traps, which feature low heating rates, high trap frequencies, and long trapping times, we demonstrate novel classical control techniques that employ parametric voltage solutions for elegant composition of shuttling operations and accurate control over the curvature of the confining potential. To demonstrate the viability of Sandia's microfabricated ion traps for quantum information processing, we’ve realized of high-fidelity single-qubit gates below a rigorous fault tolerance threshold for general noise [2,3] and two-qubit Mølmer-Sørensen gates with a process fidelity of 99.58(6)%.