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The circuit needs fewer logical qubits than any estimate its authors compared but, in its latest version, 24 to 27 times the Toffoli gates of two earlier low-qubit designs. The authors did not estimate physical qubits or running time.
Xuhui's incubation zone launched with 26 companies, and Zhangjiang Quantum Bay with three platforms and four first tenants, state media reported. The same reports said both districts' dedicated quantum support policies were still in preparation.
In measurement-device-independent QKD, an untrusted relay makes every measurement, so the detector attacks demonstrated on commercial systems no longer work. Researchers have still taken full keys through a flawed transmitter. Users also give up key rate.
CAS Cold Atom Technology disclosed single- and two-qubit gate fidelities of 99.9% and 99% for Hanyuan-2. Chinese newspapers that reported the launch did not say whether atoms in its two arrays can be entangled with each other.
McKinsey took its $15.3 billion for China's public quantum funding from CIFAR, which converted a reported ¥100 billion for one national laboratory in 2021. No published Chinese budget confirms it. A congressman has described it as investment.
Shenzhen researchers reported logical operations on two logical qubits stored in phosphorus atoms. SQC described a processor with 11 physical qubits. QuTech, RIKEN, Intel, Diraq, and imec published results from quantum dots made in labs and in industrial fabs.
A Shenzhen team encoded two logical qubits in four phosphorus nuclear spins with an error-detecting code. Its logical gates averaged about 86% fidelity, below the more than 95% its physical gates averaged.
Two state-run outlets, citing a research center directed by Origin Quantum's chief scientist, described the operating system as compatible with superconducting, trapped-ion, and neutral-atom processors and its release as a world first.
