Quantum CZ Gates on a Single Gradient Metasurface

Recent advances in metasurface design and quantum optics applications with machine learning, physics-informed neural networks, and topology optimization methods

As a two-dimensional planar material with low depth profile, a metasurface can generate non-classical phase distributions for the transmitted and reflected electromagnetic waves at its interface. Thus, it offers more flexibility to control the wave front. A traditional metasurface design process mainly adopts the forward prediction algorithm, such as Finite Difference Time Domain, combined with manual parameter optimization. However, such method…

Quantum CZ Gates on a Single Gradient Metasurface

Researchers from Peking University and collaborators have proposed a novel scheme to realize quantum controlled-Z (CZ) gates using a single gradient metasurface. This innovation enables high-density and multifunctional quantum integration on a chip, paving the way for efficient on-chip quantum information processing.

A Google Quantum AI engineer has demonstrated that a quantum computer with less than one million qubits could break an RSA 2048 key in less than a week, compared to 20 million previously estimated. Although Bitcoin does not use RSA but ECC, this cryptography is also vulnerable to quantum algorithms, especially that of Shor. Concrete experiments are already underway, with a reward of 1 BTC promised to break an ECC key of 1 to 25 bits using a quan…

Quantum Computers: New Google Quantum Findings May Accelerate Bitcoin Wallet Vulnerability Timeline

The latest research report has reduced the number of qubits required to crack the RSA encryption used in Bitcoin wallets to around 1 million.  Experts have hinted that while this could spell doom for the industry and the banking sector, it could also help to recover long-lost Bitcoin wallets.  In a previous study co-authored by Google Quantum Researcher Craig Gidney, 20 million noisy qubits were estimated to be enough to break an RSA encryption …