Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

International Conference Laser Optics (ICLO)

The implementation of the MS-gate on an ion trap Ca40 quantum computer

N.V. Morozov, L. A. Akopyan, N. Sterligov, A.N. Matveev, M.M. Borisov, Olga Lakhmanskaya, Kirill Lakhmanskiy

Published Jul 1, 2024• 0 citations
Publisher

Abstract

We demonstrate the implementation of a Molmer-Sorensen gate entangling two optical ${ }^{40} \mathrm{Ca}+$ ion qubits in a linear Paul trap without magnetic shield. We obtain the total fidelity of $\mathbf{9 1 . 7 \%}$ for the gate duration $\boldsymbol{t}_{\text {gate }}=69 \mu \mathrm{s}$. This result is comparable to the modern laboratories operating similar systems.

DOI
10.1109/iclo59702.2024.10624531

Related papers

Robust Entanglement Gates for Trapped-Ion Qubits

Yotam Shapira, Ravid Shaniv, Tom Manovitz +2 more

High-fidelity two-qubit entangling gates play an important role in many quantum information processing tasks and are a necessary building block for constructing a universal quantum computer. Such high-fidelity gates have been demonstrated on trapped-ion qubits; however, control errors and noise in gate parameters may still lead to reduced fidelity. Here we propose and demonstrate a general family of two-qubit entangling gates which are robust to different sources of noise and control errors. These gates generalize the renowned Mølmer-Sørensen gate by using multitone drives. We experimentally implemented several of the proposed gates on ^{88}Sr^{+} ions trapped in a linear Paul trap and verified their resilience.

arXiv:1805.06806•Physical Review Letters•Nov 1, 2018•103 citations

A simplified Mølmer–Sørensen gate for the trapped ion quantum computer

Hiroo Azuma

Abstract We discuss how to simplify the Mølmer–Sørensen (MS) gate which is used for the trapped ion quantum computer. The original MS gate is implemented by illuminating two ions with bichromatic coherent light fields separately at the same time. In this paper, we propose a method for transforming a separable state of two ions into one of the Bell states by illuminating the two ions with monochromatic coherent light fields individually and this point is the advantage of our scheme over the original MS gate. The length of the execution time of our proposed gate is comparable to that of the original MS gate, however, numerical calculations show that our proposed gate is weakly sensitive to thermal fluctuations of the phonons. By giving another example of a simple two-ion gate that can generate entanglement but is strongly vulnerable to thermal fluctuations, we show that our simplified MS gate is more marked than usual.

arXiv:2112.07855•Physica Scripta•Feb 27, 2024•3 citations

Transport-Enabled Entangling Gate for Trapped Ions

Holly N. Tinkey, Craig R. Clark, Brian C. Sawyer +1 more

We implement a 2-qubit entangling Mølmer-Sørensen interaction by transporting two cotrapped ^{40}Ca^{+} ions through a stationary, bichromatic optical beam within a surface-electrode Paul trap. We describe a procedure for achieving a constant Doppler shift during the transport, which uses fine temporal adjustment of the moving confinement potential. The fixed interaction duration of the ions transported through the laser beam as well as the dynamically changing ac Stark shift require alterations to the calibration procedures used for a stationary gate. We use the interaction to produce Bell states with fidelities commensurate to those of stationary gates performed in the same system. This result establishes the feasibility of actively incorporating ion transport into quantum information entangling operations.

arXiv:2109.03865•Physical Review Letters•Jan 31, 2022•14 citations

Composite Mølmer-Sørensen gate

Kaloyan N. Zlatanov, Svetoslav S. Ivanov, Nikolay V. Vitanov

The Mølmer-Sørensen (MS) gate is a two-qubit controlled-phase gate in ion traps that is highly valued due to its ability to preserve the motional state of the ions. However, its fidelity is obstructed by errors affecting the motion of the ions as well as the rotation of the qubits. In this work, we propose an amplitude-modulated composite MS gate which features high fidelity robust to gate timing, detuning and coupling errors and is also tolerant of a.c. Stark shifts and drifting detuning errors.

arXiv:2501.18436•Physical Review Applied•Feb 17, 2026•1 citation

Compact Ion-Trap Quantum Computing Demonstrator

Ivan Pogorelov, Thomas Feldker, Christian D. Marciniak +13 more

Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry.Transitioning from lab-based, proof-of-concept experiments to robust, integrated realizations of quantum information processing hardware is an important step in this process.However, the nature of traditional laboratory setups does not offer itself readily to scaling up system sizes or allow for applications outside of laboratory-grade environments.This transition requires overcoming challenges in engineering and integration without sacrificing the state-of-the-art performance of laboratory implementations.Here, we present a 19-inch rack quantum computing demonstrator based on 40 Ca + optical qubits in a linear Paul trap to address many of these challenges.We outline the mechanical, optical, and electrical subsystems.Furthermore, we describe the automation and remote access components of the quantum computing stack.We conclude by describing characterization measurements relevant to quantum computing including site-resolved single-qubit interactions, and entangling operations mediated by the Mølmer-Sørensen interaction delivered via two distinct addressing approaches.Using this setup, we produce maximally entangled Greenberger-Horne-Zeilinger states with up to 24 ions without the use of postselection or error mitigation techniques; on par with well-established conventional laboratory setups.

arXiv:2101.11390•PRX Quantum•Jun 17, 2021•386 citations

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

Peter Maunz

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

•Nov 9, 2017•0 citations
We demonstrate the implementation of a Molmer-Sorensen gate entangling two optical 40Ca+{ }^{40} \mathrm{Ca}+40Ca+ ion qubits in a linear Paul trap without magnetic shield. We obtain the total fidelity of 91.7%\mathbf{9 1 . 7 \%}91.7% for the gate duration tgate =69μs\boldsymbol{t}_{\text {gate }}=69 \mu \mathrm{s}tgate ​=69μs. This result is comparable to the modern laboratories operating similar systems.
High-fidelity two-qubit entangling gates play an important role in many quantum information processing tasks and are a necessary building block for constructing a universal quantum computer. Such high-fidelity gates have been demonstrated on trapped-ion qubits; however, control errors and noise in gate parameters may still lead to reduced fidelity. Here we propose and demonstrate a general family of two-qubit entangling gates which are robust to different sources of noise and control errors. These gates generalize the renowned Mølmer-Sørensen gate by using multitone drives. We experimentally implemented several of the proposed gates on ^{88}Sr^{+} ions trapped in a linear Paul trap and verified their resilience.
Abstract We discuss how to simplify the Mølmer–Sørensen (MS) gate which is used for the trapped ion quantum computer. The original MS gate is implemented by illuminating two ions with bichromatic coherent light fields separately at the same time. In this paper, we propose a method for transforming a separable state of two ions into one of the Bell states by illuminating the two ions with monochromatic coherent light fields individually and this point is the advantage of our scheme over the original MS gate. The length of the execution time of our proposed gate is comparable to that of the original MS gate, however, numerical calculations show that our proposed gate is weakly sensitive to thermal fluctuations of the phonons. By giving another example of a simple two-ion gate that can generate entanglement but is strongly vulnerable to thermal fluctuations, we show that our simplified MS gate is more marked than usual.
We implement a 2-qubit entangling Mølmer-Sørensen interaction by transporting two cotrapped ^{40}Ca^{+} ions through a stationary, bichromatic optical beam within a surface-electrode Paul trap. We describe a procedure for achieving a constant Doppler shift during the transport, which uses fine temporal adjustment of the moving confinement potential. The fixed interaction duration of the ions transported through the laser beam as well as the dynamically changing ac Stark shift require alterations to the calibration procedures used for a stationary gate. We use the interaction to produce Bell states with fidelities commensurate to those of stationary gates performed in the same system. This result establishes the feasibility of actively incorporating ion transport into quantum information entangling operations.
The Mølmer-Sørensen (MS) gate is a two-qubit controlled-phase gate in ion traps that is highly valued due to its ability to preserve the motional state of the ions. However, its fidelity is obstructed by errors affecting the motion of the ions as well as the rotation of the qubits. In this work, we propose an amplitude-modulated composite MS gate which features high fidelity robust to gate timing, detuning and coupling errors and is also tolerant of a.c. Stark shifts and drifting detuning errors.
Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry.Transitioning from lab-based, proof-of-concept experiments to robust, integrated realizations of quantum information processing hardware is an important step in this process.However, the nature of traditional laboratory setups does not offer itself readily to scaling up system sizes or allow for applications outside of laboratory-grade environments.This transition requires overcoming challenges in engineering and integration without sacrificing the state-of-the-art performance of laboratory implementations.Here, we present a 19-inch rack quantum computing demonstrator based on 40 Ca + optical qubits in a linear Paul trap to address many of these challenges.We outline the mechanical, optical, and electrical subsystems.Furthermore, we describe the automation and remote access components of the quantum computing stack.We conclude by describing characterization measurements relevant to quantum computing including site-resolved single-qubit interactions, and entangling operations mediated by the Mølmer-Sørensen interaction delivered via two distinct addressing approaches.Using this setup, we produce maximally entangled Greenberger-Horne-Zeilinger states with up to 24 ions without the use of postselection or error mitigation techniques; on par with well-established conventional laboratory setups.