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Heralded high-fidelity quantum hyper-CNOT gates assisted by charged quantum dots inside single-sided optical
Optics Express
|July 16, 2021
Summary
Researchers developed five schemes for heralded four-qubit hyper-controlled-not (hyper-CNOT) gates using quantum dots. This advancement simplifies quantum circuits and enhances quantum information processing speed and fidelity.
Area of Science:
- Quantum Information Processing
- Quantum Optics
- Semiconductor Physics
Background:
- Photonic hyper-parallel quantum information processing (QIP) offers advantages in circuit simplification, speed, resource efficiency, and noise suppression.
- Semiconductor quantum dots (QDs) within optical microcavities are promising platforms for QIP.
Purpose of the Study:
- To propose novel schemes for heralded four-qubit hyper-controlled-not (hyper-CNOT) gates.
- To cover all operational cases for hyper-CNOT gates on two-photon systems, utilizing polarization and spatial-mode degrees of freedom (DoFs).
Main Methods:
- Utilizing singly charged semiconductor quantum dots (QDs) inside single-sided optical microcavities.
- Developing a novel heralding mechanism to achieve high-fidelity gates without strong coupling requirements.
Main Results:
- Proposed five distinct schemes for heralded four-qubit hyper-CNOT gates.
- Achieved principle fidelity to unity for each hyper-CNOT gate through the novel heralding mechanism.
- Demonstrated adaptability and scalability of the proposed schemes for current experimental technologies.
Conclusions:
- The proposed heralded high-fidelity photonic hyper-CNOT gates are accessible with current technologies.
- These gates have significant potential for high-capacity quantum communication and fast quantum computing.
- The work contributes to the advancement of quantum information processing (QIP).
