High-Fidelity Two-Qubit Gates Using a Microelectromechanical-System-Based Beam Steering System for Individual Qubit Addressing.

@article{Wang2020HighFidelityTG,
  title={High-Fidelity Two-Qubit Gates Using a Microelectromechanical-System-Based Beam Steering System for Individual Qubit Addressing.},
  author={Ye Wang and Stephen Crain and Chao Fang and Bichen Zhang and Shilin Huang and Qiyao Liang and Pak Hong Leung and Kenneth R. Brown and Jungsang Kim},
  journal={Physical review letters},
  year={2020},
  volume={125 15},
  pages={
          150505
        }
}
In a large scale trapped atomic ion quantum computer, high-fidelity two-qubit gates need to be extended over all qubits with individual control. We realize and characterize high-fidelity two-qubit gates in a system with up to four ions using radial modes. The ions are individually addressed by two tightly focused beams steered using microelectromechanical system mirrors. We deduce a gate fidelity of 99.49(7)% in a two-ion chain and 99.30(6)% in a four-ion chain by applying a sequence of up to… 

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References

SHOWING 1-10 OF 52 REFERENCES

High-speed low-crosstalk detection of a 171Yb+ qubit using superconducting nanowire single photon detectors

Qubits used in quantum computing suffer from errors, either from the qubit interacting with the environment, or from imperfect quantum logic gates. Effective quantum error correcting codes require a

Two-qubit entangling gates within arbitrarily long chains of trapped ions

Ion trap quantum computers are based on modulating the Coulomb interaction between atomic ion qubits using external forces. However, the spectral crowding of collective motional modes could pose a

Individual addressing of trapped 171Yb+ ion qubits using a microelectromechanical systems-based beam steering system

The ability to individually manipulate the increasing number of qubits is one of the many challenges towards scalable quantum information processing with trapped ions. Using micro-mirrors fabricated

Benchmarking an 11-qubit quantum computer

The quality of the 11-qubit fully-connected, programmable quantum computer in a trapped ion system composed of 13 171Yb+ ions is characterised by successfully computing two quantum algorithms.

Global entangling gates on arbitrary ion qubits

This work proposes and implements a scalable scheme for realizing global entangling gates on multiple 171Yb+ ion qubits by coupling to multiple motional modes through modulated laser fields and develops a system with fully independent control capability on each ion.

On the generators of quantum dynamical semigroups

The notion of a quantum dynamical semigroup is defined using the concept of a completely positive map. An explicit form of a bounded generator of such a semigroup onB(ℋ) is derived. This is a quantum

QUANTUM COMPUTATION WITH IONS IN THERMAL MOTION

We propose an implementation of quantum logic gates via virtual vibrational excitations in an ion-trap quantum computer. Transition paths involving unpopulated vibrational states interfere

Phase Control of Trapped Ion Quantum Gates

There are several known schemes for entangling trapped ion quantum bits for large-scale quantum computation. Most are based on an interaction between the ions and external optical fields, coupling

Phase-Modulated Entangling Gates Robust to Static and Time-Varying Errors

Entangling operations are among the most important primitive gates employed in quantum computing and it is crucial to ensure high-fidelity implementations as systems are scaled up. We experimentally

Entangling an arbitrary pair of qubits in a long ion crystal

It is well established that the collective motion of ion crystals can be used as a quantum bus for multi-qubit entanglement. However, as the number of ions increases, it becomes difficult to directly
...