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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Feb 25, 2026

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Robust hyperparallel photonic quantum entangling gate with cavity QED.

Bao-Cang Ren, Fu-Guo Deng

|August 10, 2017

Summary

This summary is machine-generated.

Researchers developed a robust quantum gate for two photons using diamond nitrogen vacancy centers. This hyperparallel photonic gate enhances entanglement operations, reduces resource consumption, and minimizes photonic dissipation for efficient quantum computing.

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Area of Science:

Quantum Information Science
Quantum Optics
Solid-State Quantum Systems

Background:

Diamond nitrogen vacancy (NV) centers are promising solid-state qubits.
Optical cavities enhance light-matter interactions crucial for quantum gates.
Cavity quantum electrodynamics (cQED) provides a framework for controlling quantum states.

Purpose of the Study:

To present a robust hyperparallel photonic controlled-phase-flip gate.
To utilize the balance condition in an optical cavity with diamond NV centers.
To perform quantum entangling operations on a two-photon system across polarization and spatial modes.

Main Methods:

Embedding a diamond nitrogen vacancy center within an optical cavity.
Leveraging cavity quantum electrodynamics principles to achieve a balance condition.
Implementing a photonic controlled-phase-flip gate utilizing polarization and spatial-mode degrees of freedom.

Main Results:

A hyperparallel photonic controlled-phase-flip gate with near-unit fidelity was demonstrated.
Efficient depression of noise from unequal reflection coefficients was achieved.
The gate doubles quantum entangling operations synchronously, reducing resource consumption and photonic dissipation.

Conclusions:

The balance condition in optical cavities enables robust quantum gate operations.
This approach is feasible in both weak and strong coupling regimes.
Experimental realization of high-fidelity quantum gates is facilitated by the balance condition.