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

Quantum Information and Measurement (QIM)

Quantum repeaters based on two species trapped ions

Vladimir S. Malinovsky, Siddhartha Santra, Sreraman Muralidharan, Liang Jiang, Christopher R. Monroe

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We consider two species trapped ions as building blocks of large-scale quantum repeaters across trans-continental distances. Key generation rate dependence on experimental gate error rates, operation time and coupling efficiency to a fiber is discussed.
DOI
10.1364/qim.2019.t5a.77

Related papers

Entanglement as a resource for quantum networking

Vladimir S. Malinovsky, Siddhartha Santra, Liang Jiang +1 more

We examine the viability of quantum repeaters based on two-species trapped ion modules for long-distance quantum key distribution. We discuss the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficiency, gate infidelity, operation time and length of the elementary links.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2019•0 citations

Quantum Repeaters Based on Two-Species Trapped Ions

Sreraman Muralidharan, Siddhartha Santra, Liang Jiang +2 more

Trapped ions technology is the most promising candidate for construction of the large-scale quantum computers, quantum repeaters and quantum networks. Quantum networks require matter qubits with fast quantum gates and measurement, efficient coupling to photons and low gate error rates. There was growing progress in two-species ion trapping [1], where one ion acts as a communication qubit that can be efficiently entangled to photon and the other one used as excellent quantum memories allowing efficient local processing. However, the photonic interface needed for communication ions must not affect the state of the quantum memory ion. In a recent experimental breakthrough, the isolation between quantum memory ion (171Yb+) and communication ion (138Ba+) was achieved and a quantum state transfer between the ions has been demonstrated.

IEEE/LEOS Summer Topical Meetings•Jul 1, 2018•2 citations

Quantum repeaters based on two species trapped ions

Siddhartha Santra, Sreraman Muralidharan, Martin Lichtman +3 more

Abstract We examine the viability of quantum repeaters based on two-species trapped ion modules for long-distance quantum key distribution. Repeater nodes comprised of ion-trap modules of co-trapped ions of distinct species are considered. The species used for communication qubits has excellent optical properties while the other longer lived species serves as a memory qubit in the modules. Each module interacts with the network only via single photons emitted by the communication ions. Coherent Coulomb interaction between ions is utilized to transfer quantum information between the communication and memory ions and to achieve entanglement swapping between two memory ions. We describe simple modular quantum repeater architectures realizable with the ion-trap modules and numerically study the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficiency, gate infidelity, operation time and length of the elementary links. Our analysis suggests crucial improvements necessary in a physical implementation for co-trapped two-species ions to be a competitive platform in long-distance quantum communication.

arXiv:1811.10723•New Journal of Physics•Jun 17, 2019•31 citations

Multiplexed quantum repeaters based on dual-species trapped-ion systems

Prajit Dhara, Norbert M. Linke, Edo Waks A +2 more

Multiplexed trapped-ion quantum repeaters allow for high-rate communications between distant quantum computers, and the ability to co-trap multiple ion species means there is no need to compromise between qubit lifetime and interfacing capability. Here, the authors show a significant improvement in entanglement distribution rates by considering a time-multiplexed quantum repeater protocol and treating the time step as a free parameter in such networks.

arXiv:2105.06707•Physical Review A•Feb 25, 2022•30 citations

Quantum Repeater Goes the Distance

Michal Hajdušek

A quantum repeater based on trapped ions allows the transmission of entangled, telecom-wavelength photons over 50 km.

Physics•May 22, 2023•0 citations

Extending Quantum Links: Modules for Fiber‐ and Memory‐Based Quantum Repeaters

Peter van Loock, Wolfgang Alt, Christoph Becher +9 more

Abstract Elementary building blocks for quantum repeaters based on fiber channels and memory stations are analyzed. Implementations are considered for three different physical platforms, for which suitable components are available: quantum dots, trapped atoms and ions, and color centers in diamond. The performances of basic quantum repeater links for these platforms are evaluated and compared, both for present‐day, state‐of‐the‐art experimental parameters as well as for parameters that can in principle be reached in the future. The ultimate goal is to experimentally explore regimes at intermediate distances—up to a few 100 km—in which the repeater‐assisted secret key transmission rates exceed the maximal rate achievable via direct transmission. Two different protocols are considered, one of which is better adapted to the higher source clock rate and lower memory coherence time of the quantum dot platform, while the other circumvents the need of writing photonic quantum states into the memories in a heralded, nondestructive fashion. The elementary building blocks and protocols can be connected in a modular form to construct a quantum repeater system that is potentially scalable to large distances.

arXiv:1912.10123•Advanced Quantum Technologies•Oct 20, 2020•5 citations
Trapped ions technology is the most promising candidate for construction of the large-scale quantum computers, quantum repeaters and quantum networks. Quantum networks require matter qubits with fast quantum gates and measurement, efficient coupling to photons and low gate error rates. There was growing progress in two-species ion trapping [1], where one ion acts as a communication qubit that can be efficiently entangled to photon and the other one used as excellent quantum memories allowing efficient local processing. However, the photonic interface needed for communication ions must not affect the state of the quantum memory ion. In a recent experimental breakthrough, the isolation between quantum memory ion (171Yb+) and communication ion (138Ba+) was achieved and a quantum state transfer between the ions has been demonstrated.
Abstract We examine the viability of quantum repeaters based on two-species trapped ion modules for long-distance quantum key distribution. Repeater nodes comprised of ion-trap modules of co-trapped ions of distinct species are considered. The species used for communication qubits has excellent optical properties while the other longer lived species serves as a memory qubit in the modules. Each module interacts with the network only via single photons emitted by the communication ions. Coherent Coulomb interaction between ions is utilized to transfer quantum information between the communication and memory ions and to achieve entanglement swapping between two memory ions. We describe simple modular quantum repeater architectures realizable with the ion-trap modules and numerically study the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficiency, gate infidelity, operation time and length of the elementary links. Our analysis suggests crucial improvements necessary in a physical implementation for co-trapped two-species ions to be a competitive platform in long-distance quantum communication.
Abstract Elementary building blocks for quantum repeaters based on fiber channels and memory stations are analyzed. Implementations are considered for three different physical platforms, for which suitable components are available: quantum dots, trapped atoms and ions, and color centers in diamond. The performances of basic quantum repeater links for these platforms are evaluated and compared, both for present‐day, state‐of‐the‐art experimental parameters as well as for parameters that can in principle be reached in the future. The ultimate goal is to experimentally explore regimes at intermediate distances—up to a few 100 km—in which the repeater‐assisted secret key transmission rates exceed the maximal rate achievable via direct transmission. Two different protocols are considered, one of which is better adapted to the higher source clock rate and lower memory coherence time of the quantum dot platform, while the other circumvents the need of writing photonic quantum states into the memories in a heralded, nondestructive fashion. The elementary building blocks and protocols can be connected in a modular form to construct a quantum repeater system that is potentially scalable to large distances.