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Robust and Resource-Efficient Microwave Near-Field Entangling ^{9}Be^{+} Gate.

G Zarantonello1,2, H Hahn1,2, J Morgner1,2

  • 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany.

Physical Review Letters
|January 18, 2020
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Summary
This summary is machine-generated.

Amplitude-shaped microwave pulses improve trapped-ion quantum gates. This technique enhances resilience to motional frequency noise, crucial for reliable quantum computing with beryllium ion qubits.

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Area of Science:

  • Quantum information science
  • Atomic physics
  • Quantum computing

Background:

  • Microwave trapped-ion quantum logic gates offer an alternative to laser-based approaches, circumventing spontaneous emission as a decoherence source.
  • Despite advantages, microwave gates are slower than laser gates, increasing sensitivity to motional mode frequency fluctuations.

Purpose of the Study:

  • To develop and implement amplitude-shaped gate drives for microwave trapped-ion quantum logic gates.
  • To enhance the resilience of two-qubit gates to motional mode frequency fluctuations without increasing pulse energy.

Main Methods:

  • Proposal and implementation of amplitude-shaped microwave pulse sequences for quantum logic gates.
  • Utilizing beryllium ion ({}^{9}Be^{+}) qubits for experimental demonstration.
  • Injecting noise during two-qubit entangling gate operations to test resilience.

Main Results:

  • Amplitude-shaped gate drives demonstrate resilience to motional frequency noise.
  • Operation infidelity in the 10^{-3} range was achieved in the absence of injected noise.
  • The proposed method enhances gate performance under realistic noise conditions.

Conclusions:

  • Amplitude shaping is an effective strategy to improve the robustness of microwave trapped-ion quantum gates.
  • This technique offers a pathway to faster and more reliable quantum operations in trapped-ion systems.
  • The findings contribute to the advancement of scalable and fault-tolerant quantum computing architectures.