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According to a recent report by the Physiologist Network, Swedish and Austrian physicists joined hands to develop the single quantum bit Rydberg gate, the first basic element of a new quantum computer, the captive Rydberg ion quantum computer . Recent research has demonstrated the feasibility of building such a quantum computer that has the potential to overcome the scaling problems faced by current quantum computing methods.
At present, one of the biggest problems that quantum computers face 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 reason for the difficulty of the upgrade is due in part to the multi-quantum bit logic gates commonly used in systems that trap ions, which can cause "spectral crowding" problems as the number of qubits increases. However, the system of imprisoning Riedert's ions is immune to spectral crowding problems, suggesting that a quantum computer based on imprisoned Riedelberg ions as a qubit may be a more capable quantum computer.
In a recent paper in the Physical Review Letters, the researchers said they built the first single quantum bit Reedberger. To do this, it is necessary to create a single ion Rydberg coherent excitation. They first start with a strontium ion trapped in a trap, then use a laser to excite ions from a low quantum state to a first excited state and then to a more energetic Rydberg state.
The key to the experiment is that the Riedeburg state is coherently obtained, which is crucial for the construction of the multi-quantum bit Reedberger. The researchers combined coherent Rydberg excitation with a quantum manipulation method to show the single quantum bit Reedberger. They estimate that this single-qubit system can be extended to a system of two qubits and more can be added in the future.
In addition to potential upgrade benefits, quantum computers based on imprisoned Riedeber ions have other advantages, including better control of quantum bits, faster gate calculations, etc. They will further investigate these possibilities.
Gerald Higgins, head of research, said: "Next, we will measure the intense interaction between two Rydberg ions and entangle them. The trapped Rydberg ions have the potential to generate very large entanglements state."
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