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Tunable capacitive coupling between two semiconductor charge qubits.

Guo-Dong Yu1, Hai-Ou Li, Gang Cao

  • 1Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

Nanotechnology
|June 30, 2016
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Summary
This summary is machine-generated.

Strong coupling between qubits is crucial for quantum computing. This study demonstrates tunable capacitive coupling in double quantum dots, achieving energy levels suitable for high-fidelity quantum logic operations and entanglement.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Quantum Information Science

Background:

  • High-fidelity two-qubit logic operations are essential for scalable quantum computing.
  • Achieving strong coupling between qubits is a primary requirement for these operations.

Purpose of the Study:

  • To experimentally investigate and enhance capacitive coupling between two qubits in double quantum dots.
  • To demonstrate the tunability of coupling energy (J) over a broad range.
  • To analyze the impact of coupling energy on two-qubit operations.

Main Methods:

  • Experimental investigation of capacitive coupling using double quantum dots.
  • Utilizing a pair of open slot confinement gates to enhance qubit coupling.
  • Performing numerical simulations to study the effect of coupling energy (J) on two-qubit operations.

Main Results:

  • Demonstrated convenient tunability of coupling energy (J) in a broad range.
  • Experimental coupling energy (J) was found to be adequate for high-fidelity operations.
  • Numerical simulations confirmed the suitability of the obtained J for entanglement and logic gates.

Conclusions:

  • The developed method allows for tunable and strong coupling between qubits.
  • The achieved coupling strengths are sufficient for implementing high-fidelity two-qubit gates.
  • This work contributes to the advancement of scalable quantum computing architectures.