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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Scalable photonic quantum computing assisted by quantum-dot spin in double-sided optical microcavity.

Hai-Rui Wei¹, Fu-Guo Deng

¹Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.

|August 14, 2013

Summary

We demonstrate scalable photonic quantum computing using quantum-dot spin in a microcavity. This method enables deterministic two-qubit gates and multi-qubit operations for advanced quantum circuits.

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Area of Science:

Quantum Information Science
Cavity Quantum Electrodynamics
Solid-State Quantum Computing

Background:

Scalable photonic quantum computing is a key challenge.
Cavity quantum electrodynamics offers novel approaches for quantum control.
Quantum dots in optical microcavities provide a promising platform.

Purpose of the Study:

To investigate scalable photonic quantum computing.
To utilize giant optical circular birefringence for quantum gates.
To demonstrate deterministic multi-qubit gates on photonic qubits.

Main Methods:

Employing quantum-dot spin in a double-sided optical microcavity.
Implementing deterministic controlled-not gates via single-photon input-output processes.
Utilizing electron-spin readout within an optical resonant microcavity.

Main Results:

Demonstrated a deterministic controlled-not gate for two photonic qubits.
Proposed a quantum circuit for a three-photon Toffoli gate.
Achieved high fidelities and efficiencies under low cavity loss rates.

Conclusions:

The proposed method enables scalable photonic quantum computing.
The device operates effectively in both strong and weak coupling regimes.
This approach is applicable to complex multi-qubit gates.