I Molecular Quantum Computer Progress

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Researchers have made significant advancements in molecular quantum computing by successfully trapping molecules to execute quantum operations. They achieved a two-qubit Bell state entanglement with 94 percent accuracy through precise control of molecular rotation. The experiment utilized the iSWAP gate to swap qubit states and apply a phase shift, crucial for establishing entanglement. While these developments mark progress in the field, some view them as preliminary steps toward more complex quantum systems. Overall, the findings indicate a promising direction for future molecular quantum computing research.
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Trapping molecules to perform quantum operations.
https://arxiv.org/abs/2406.15345

Trapping molecules to perform quantum operations. By carefully controlling how the molecules rotated with respect to one another, the team managed to entangle two molecules, creating a quantum state known as a two-qubit Bell state with 94 percent accuracy. The iSWAP gate used in this experiment swapped the states of two qubits and applied what is called a phase shift, an essential step in generating entanglement where the states of two qubits become correlated regardless of the distance in between.
 
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So progress. For the uninitiated like me it does sound like baby steps though.
 
For the quantum state ##|l,m\rangle= |2,0\rangle## the z-component of angular momentum is zero and ##|L^2|=6 \hbar^2##. According to uncertainty it is impossible to determine the values of ##L_x, L_y, L_z## simultaneously. However, we know that ##L_x## and ## L_y##, like ##L_z##, get the values ##(-2,-1,0,1,2) \hbar##. In other words, for the state ##|2,0\rangle## we have ##\vec{L}=(L_x, L_y,0)## with ##L_x## and ## L_y## one of the values ##(-2,-1,0,1,2) \hbar##. But none of these...

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