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Demonstration of two-qubit algorithms with a superconducting quantum processor
A two-qubit superconducting processor and the implementation of the Grover search and Deutsch–Jozsa quantum algorithms are demonstrated and the generation of highly entangled states with concurrence up to 94 per cent is allowed. Expand
Detecting bit-flip errors in a logical qubit using stabilizer measurements
This work realizes the two parity measurements comprising the stabilizers of the three-qubit repetition code protecting one logical qubit from physical bit-flip errors, a critical step towards larger codes based on multiple parity measurements. Expand
Scalable Quantum Circuit and Control for a Superconducting Surface Code
By pipelining the interaction and readout steps of ancilla-based X- and Z-type stabilizer measurements, this work can engineer detuning patterns that avoid all second-order transmon-transmon interactions except those exploited in controlled-phase gates, regardless of fabric size. Expand
Quantum Hall Effect in a Gate-Controlled p-n Junction of Graphene
The realization of a single-layer graphene p-n junction is reported in which carrier type and density in two adjacent regions are locally controlled by electrostatic gating, consistent with recent theory. Expand
Preparation and measurement of three-qubit entanglement in a superconducting circuit
Deterministic production of three-qubit Greenberger–Horne–Zeilinger (GHZ) states with fidelity of 88 per cent is demonstrated, demonstrating the first step of basic quantum error correction, namely the encoding of a logical qubit into a manifold of GHZ-like states using a repetition code. Expand
Differential charge sensing and charge delocalization in a tunable double quantum dot.
Measurements of a tunable double quantum dot, operating in the quantum regime, with integrated local charge sensors are reported, demonstrating that local charge sensing can be used to accurately determine the interdot coupling in the absence of transport. Expand
Realization of three-qubit quantum error correction with superconducting circuits
This work encodes a quantum state, induce errors on the qubits and decode the error syndrome, which is used as the input to a three-qubit gate that corrects the primary qubit if it was flipped, and demonstrates the predicted first-order insensitivity to errors. Expand
High Kinetic Inductance Superconducting Nanowire Resonators for Circuit QED in a Magnetic Field
We present superconducting microwave-frequency resonators based on NbTiN nanowires. The small cross section of the nanowires minimizes vortex generation, making the resonators resilient to magneticExpand
Reducing intrinsic loss in superconducting resonators by surface treatment and deep etching of silicon substrates
We present microwave-frequency NbTiN resonators on silicon, systematically achieving internal quality factors above 1 M in the quantum regime. We use two techniques to reduce losses associated withExpand
Millisecond charge-parity fluctuations and induced decoherence in a superconducting transmon qubit
By integrating recent developments in high-fidelity qubit readout and feedback control in circuit quantum electrodynamics, a state-of-the-art transmon is transformed into its own real-time charge-parity detector and it is demonstrated that quasiparticle tunnelling does not presently bottleneck transmon qubit coherence. Expand