Good news! More advances in quantum computing!
"... The most exciting thing about the new results ... is that they demonstrate it’s possible to actually compute on an error-corrected quantum computer. Previous experiments have shown that it’s possible to use error correction to “keep quantum information alive ...
This simplicity allowed them to teleport logical qubits with a fidelity of 97.5 percent, significantly exceeding the target set by IARPA. Not all quantum computers can use transversal gates, however, as many architectures feature qubits that are fixed in place, including those that rely on superconducting qubits. So the team also tested another approach known as “lattice surgery,” which makes it possible to entangle logical qubits without direct interaction between all of their physical qubits. However, the approach is more complicated and involves considerably more operations, says Hayes, so they were able to only achieve fidelities of 85.1 percent. ..."
"... Quantinuum’s demonstration marks the first time that an arbitrary quantum state has been teleported at the logical level (using a quantum error correcting code). This means that instead of teleporting the quantum state of a single physical qubit we have teleported the quantum information encoded in an entangled set of physical qubits, known as a logical qubit. In other words, the collective state of a bunch of qubits is teleported from one set of physical qubits to another set of physical qubits. ..."
From the editor's summary and abstract:
"Editor’s summary
Quantum entanglement and the teleportation of a quantum state across the processor are key ingredients in quantum computing. The fragility of the quantum states, however, requires error correction codes to ensure their faithful processing. Using a trapped-ion platform consisting of up to 30 trapped ions, the Quantinuum H2 quantum processor, ... demonstrate the fault-tolerant teleportation of quantum states. The implemented error-correcting color code effectively stabilizes the qubits, allowing quantum teleportation to be carried out in a fault-tolerant manner. The results are promising for trapped-ion–based quantum computing platforms. ...
Abstract
Quantum state teleportation is commonly used in designs for large-scale quantum computers. Using Quantinuum’s H2 trapped-ion quantum processor, we demonstrate fault-tolerant state teleportation circuits for a quantum error correction code—specifically the Steane code. The circuits use up to 30 qubits at the physical level and employ real-time quantum error correction. We conducted experiments on several variations of logical teleportation circuits using both transversal gates and lattice surgery. We measured the logical process fidelity to be 0.975 ± 0.002 for the transversal teleportation implementation and 0.851 ± 0.009 for the lattice surgery teleportation implementation as well as 0.989 ± 0.002 for an implementation of Knill-style quantum error correction."
Quantinuum achieves moonshot years ahead of schedule, demonstrating fault-tolerant high-fidelity teleportation of a logical qubit (original news release)
The H2 processor is housed in an ultrahigh-vacuum chamber
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