Quantum computers, computing devices that leverage the principles of quantum mechanics, could outperform classical computing on some complex optimization and processing tasks. In quantum computers, classical units of information (bits), which can either have a value of 1 or 0, are substituted by quantum bits or qubits, which can be in a mixture of both 0 and 1 simultaneously.
Qubits have so far been realized using various physical systems, ranging from electrons to photons and ions. In recent years, some quantum physicists have been experimenting with a new kind of qubits, known as Andreev spin qubits. These qubits leverage the properties of superconducting and semiconductor materials to store and manipulate quantum information.
A team of researchers at Delft University of Technology, led by Marta Pita-Vidal and Jaap J. Wesdorp, recently demonstrated the strong and tunable coupling between two distant Andreev spin qubits. Their paper, published in Nature Physics, could pave the way towards the effective realization of two-qubit gates between distant spins.
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