Impressive!
"... Prof. Roee Ozeri of the Weizmann Institute of Science begs to differ: “One of the world’s first computers, WEIZAC, was built here in the 1950s, when all Israel had was swamps and camels. Today Israel is a technological empire; there’s no reason we shouldn’t be front-runners in the quantum computing race.” ...
in building a quantum computer – one of about 30 such machines in the world, and one of less than 10 to rely on an advanced technology known as ion traps. An even larger computer is already in the works ...
in building a quantum computer – one of about 30 such machines in the world, and one of less than 10 to rely on an advanced technology known as ion traps. An even larger computer is already in the works ...
Despite this expansion of research, substantial challenges remain. One of the greatest obstacles is the extreme sensitivity of quantum computers to environmental noise, which stands in the way of building large, complex systems. In a project ... addressed this challenge by introducing two innovations, both successfully implemented in the quantum computer the researchers have built in their lab. ...
To prevent this from happening, the Weizmann researchers developed a pattern of laser pulses that keeps the logic gates robust and stable [in the presence of noise]. ...
a camera-based array that detects all the qubits simultaneously. Then, to protect the system’s quantum nature, they concealed some of the qubits from the camera. They also developed a way to overcome the slow-down in data processing that had been associated with camera-based arrays: They added electronic circuits that rapidly read out and process the cameras’ information, speeding up error correction. ..."
To prevent this from happening, the Weizmann researchers developed a pattern of laser pulses that keeps the logic gates robust and stable [in the presence of noise]. ...
a camera-based array that detects all the qubits simultaneously. Then, to protect the system’s quantum nature, they concealed some of the qubits from the camera. They also developed a way to overcome the slow-down in data processing that had been associated with camera-based arrays: They added electronic circuits that rapidly read out and process the cameras’ information, speeding up error correction. ..."
From the abstract:
"... Chains of ions held in a linear Paul trap are a promising platform for constructing such quantum computers, due to their long coherence times and high quality of control. Here, we report on the construction of a small five-qubit universal quantum computer using 88Sr+ ions in a radio-frequency (rf) trap. All basic operations, including initialization, quantum logic operations, and readout, are performed with high fidelity. Selective two-qubit and single-qubit gates, implemented using a narrow-line-width laser, comprise a universal gate set, allowing realization of any unitary on the quantum register. We review the main experimental tools and describe in detail unique aspects of the computer: the use of robust entangling gates and the development of a quantum coherent feedback system through electron-multiplying CCD camera acquisition. The latter is necessary for carrying out quantum error-correction protocols in future experiments."
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