Quantum scientists shrink {hardware} calls for with breakthrough error correcting gate
by Simon Mansfield
Sydney, Australia (SPX) Aug 20, 2025
Quantum scientists on the College of Sydney Nano Institute have created a brand new kind of quantum logic gate that drastically reduces the variety of bodily qubits required for computation, marking a milestone within the push towards scalable quantum computing.
The crew employed Gottesman-Kitaev-Preskill (GKP) codes, typically known as the “Rosetta stone” of quantum computing, to encode logical qubits utilizing the pure oscillations of a trapped ytterbium ion. These codes rework steady quantum oscillations into digital-like states, making errors simpler to detect and proper whereas permitting compact encoding of logical qubits.
Though lengthy thought-about a theoretical answer, GKP codes have confirmed troublesome to implement as a result of their complexity. In a research revealed in Nature Physics, the Sydney crew efficiently entangled GKP qubits inside a single trapped ion, demonstrating for the primary time common logical gate operations between them.
Dr Tingrei Tan, Sydney Horizon Fellow and lead researcher, defined: “Our experiments have proven the primary realisation of a common logical gate set for GKP qubits. We did this by exactly controlling the pure vibrations of a trapped ion so we will manipulate particular person GKP qubits or entangle them as a pair.”
By entangling two quantum states inside the similar atom, PhD scholar and first creator Vassili Matsos demonstrated a quantum logic gate utilizing solely a single ion. The experiments employed quantum management software program from Sydney spin-off Q-CTRL, designed to minimise distortion and preserve the delicate construction of GKP codes throughout computation.
“This represents a key milestone,” Dr Tan mentioned. “GKP error correction codes have lengthy promised to cut back the heavy {hardware} calls for that restrict scaling. Our experiments present high-quality quantum controls can effectively manipulate multiple logical qubit, forming the premise for large-scale quantum info processing.”
The work concerned three experiments with a single ytterbium ion held in a Paul entice at room temperature. Lasers exactly managed the ion’s vibrations, enabling the encoding of GKP qubits and their entanglement right into a purposeful logic gate.
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