Communications of the ACM
The 'Flip-Flop' Qubit: Realization of Quantum Bit in Silicon Controlled by Electric Signals
In this sketch of the silicon nanoelectronic device that hosts the 'flip-flop' qubit, the nuclear spin ('n' in orange) and the electron spin ('e' in blue) flip-flop with respect to each other while always pointing in opposite directions.
Credit: UNSW Sydney Newsroom (Australia)
Andrea Morello, Rostyslav Savytskyy, and Tim Botzem at Australia's University of New South Wales, Sydney demonstrated an electrically controlled "flip-flop" quantum bit (qubit).
The researchers demonstrated how the spin of an electron and the nuclear spin of a phosphorus atom in silicon could function as qubits.
Savytskyy explained, "This new qubit is called 'flip-flop' because it's made out of two spins belonging to the same atom—the electron and the nuclear spin—with the condition that they always point in opposite directions."
Botzem said the team was able to program arbitrary quantum states of the flip-flop qubit by swapping the electron and the nucleus' orientation "simply by applying a voltage to a small metallic electrode, instead of irradiating the chip with an oscillating magnetic field."
Morello said this approach could support multi-qubit quantum logic operations for large-scale quantum computers.
From UNSW Sydney Newsroom (Australia)
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