THE blurry realm of quantum memory just got clearer.
Ordinarily, memory cells are accessed one at a time via a 鈥渢ree鈥� with switches on each branch. A string of bits determines the switch that must be open at each level of branching in order to create a path to the required cell.
Quantum computers use a superposition of all memory cells, which means many switches at the same level must be activated at once. But if the same quantum bit, or 鈥渜ubit鈥�, activates multiple switches in the same level, they get entangled, ruining the data.
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Now researchers at the Scuola Normale Superiore in Pisa, Italy, and at the Massachusetts Institute of Technology have ensured that each switch at a particular level is activated by a different qubit, ensuring there there is no entanglement within a given level ().
