According to a report recently organized by the Physicists Organization Network, Swedish and Austrian physicists have jointly developed a single-qubit Rydberg gate, which is the first basic element of a new type of quantum computer—the imprisoned Rydberg ion quantum computer. . Recent studies have demonstrated the feasibility of building such a quantum computer, which has the potential to overcome the scaling problems currently faced by quantum computing methods.
One of the biggest problems faced by quantum computers today is how to increase the number of entangled qubits in each logic gate, which is crucial for the development of practical quantum computing devices. The difficulty in upgrading is partly due to the fact that the commonly used multi-qubit logic gates in the trapped ion system suffer from the problem of "spectrum congestion" as the number of qubits increases. However, the system of trapping Ridder ions is not affected by the spectrum congestion problem. This shows that a quantum computer developed using imprisoned Rydberg ions as qubits may become a more scalable quantum computer.
The researchers published a paper in the latest issue of the Physical Review Letters that they built the first single-qubit Riddlesgate. In order to do this, it is necessary to create a Rydberg coherent excitation of a single ion. They first start with a helium ion trapped in a trap, and then use a laser to excite ions from the low quantum state to the first excited state and then excite it to the higher energy Riedberg state.
The key point of the experiment is that the Rydberg states are obtained in a coherent manner, which is crucial for the construction of multi-qubits. The researchers combined coherent Rydberg excitations with quantum manipulation methods to demonstrate the single-qubit Rydberg gate. They estimate that this single qubit system can be extended to two qubit systems and that more qubits can be added in the future.
In addition to potential upgrade advantages, quantum computers based on trapped Rydberg ions have other advantages, including better control of qubits and faster gate operations. They will further investigate these possibilities.
The research director Gerald Higgins said: "Next, we will measure the strong interaction between the two Rydberg ions and allow them to become entangled. The trapped Rydberg ions have the potential to generate very large entanglement. State.†(Reporter Liu Xia)
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