The Univ of Tokyo: Photon Quantum Computer, ‘Large Quantum Entanglement’ Generation, at Room Temp､Space Saving
The University of Tokyo: Photon Quantum Computer
On October 18th, “We succeeded in creating a ‘large-scale quantum entanglement’ state with a quantum computer using Photon.”
Photon computer:
This Photon quantum computer uses a completely different method from the “gate method: quantum computer” under study by IBM and Google.
If it is put into practical use in the future, it will operate at room temperature and the circuit can be housed in a 10-yen coin chip.
Quantum computer: weak point of gate system
Currently, “development of gated quantum computers” is being carried out as a general-purpose quantum computing machine.
However, in the case of the gate method, there is a difficulty in increasing the scale.
As the “qubit” that is the unit of calculation increases, the wiring between qubits becomes more complicated.
The number of qubits in the gated quantum computer is only about 50 qubits as of 2019.
The University of Tokyo: Professor Akira Furusawa’s laboratory
In 13 years, we developed a device that generates countless qubits by dividing the light emitted from a single light source in time.
Succeeded in creating a ‘large-scale quantum entanglement’ state with this device.
Quantum calculation method: Adoption of “one-way quantum calculation”
The quantum computer of the Furusawa Laboratory uses a quantum calculation method called “one-way quantum calculation” instead of the gate method.
This is done by preparing a ‘quantum entangled’ state consisting of a number of qubits called “cluster states” and performing “quantum calculation” by measuring each qubit according to the quantum calculation.
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