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Jellybeans: A Sweet Solution for Overcrowded Circuitry in Quantum Computer Chips

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An artist's impression of how qubits can be physically spread apart without breaking communication channels between them essential for quantum processing.

UNSW's Arne Laucht said now that the research has proven the jellybean quantum dot is possible, the next step is to insert working qubits at each end of the jellybean quantum dot and make them talk to another.

Credit: Tony Melov/UNSW

Engineers at Australia's University of New South Wales, Sydney (UNSW Sydney) designed "jellybean" quantum dots to enhance quantum processing by physically spreading apart quantum bits (qubits) without breaking communication between them.

Laboratory experiments showed elongating the space between qubit pairs in silicon leaves more room for wiring without disrupting their interaction.

To create the jellybean, the engineers assembled chains of electrons by corralling more electrons in between the qubits.

Only the electrons at each end of the structure participate in computations, while those within the jellybean dot keep them in communication.

UNSW Sydney's Zeheng Wang explained only three to possibly 10 extra electrons are needed to make the jellybean heterogenous, while adding 15 or 20 electrons creates homogeneity and generates "your well-defined spin and quantum states that you can use to couple qubits to another."

From UNSW Sydney Newsroom (Australia)
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