Keyword

superconducting qubits

3 papers tagged “superconducting qubits”

PhysicsNature · Dec 2024 Open access

Quantum error correction below the surface code threshold

Rajeev Acharya, Dmitry A. Abanin and Laleh Aghababaie-Beni

Google Quantum AI demonstrated a superconducting surface-code memory whose logical error rate decreases as the code distance grows, crossing below the fault-tolerance threshold. Scaling from distance-3 to distance-5 to distance-7 codes, the logical qubit's error per cycle was suppressed by roughly a factor of two per increment, showing exponential error suppression. This provides experimental evidence that the surface code can reach the regime needed for scalable fault-tolerant quantum computing.

quantum error correction surface code fault tolerance superconducting qubits

PhysicsScience · Dec 2021 Open access

Realizing topologically ordered states on a quantum processor

K. J. Satzinger, Y.-J. Liu and A. Smith

Using a superconducting quantum processor, the team prepared the ground state of the toric code, a paradigmatic topologically ordered state, on a 2D lattice of qubits. They demonstrated the topological nature of the state by creating and braiding anyonic excitations and measuring nontrivial topological entanglement entropy. The work showed that programmable quantum hardware can realize and probe states with intrinsic topological order.

topological order quantum processor toric code anyons

PhysicsNature · Oct 2019 Open access

Quantum supremacy using a programmable superconducting processor

Frank Arute, Kunal Arya and Ryan Babbush

Google's team uses a 53-qubit programmable superconducting processor (Sycamore) to perform random quantum circuit sampling, a task chosen to be classically hard. They report sampling the output of a pseudo-random circuit in about 200 seconds, estimating that a leading classical supercomputer would need an impractically long time for the equivalent task, thereby claiming the first demonstration of quantum computational supremacy.

quantum supremacy superconducting qubits random circuit sampling quantum computing