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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.
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.
Quantum generative adversarial learning in a superconducting quantum circuit
It is demonstrated that, after several rounds of adversarial learning, a quantum-state generator can be trained to replicate the statistics of the quantum data output from a quantum channel simulator, with a high fidelity so that the discriminator cannot distinguish between the true and the generated data.
Characterizing entanglement of an artificial atom and a cavity cat state with Bell's inequality
This work uses the Clauser–Horne–Shimony–Holt formulation of a Bell test to characterize entanglement between an artificial atom and a cat state, or a Bell-cat, and detects correlations that surpass the classical maximum of the Bell inequality.
Quantum error correction and universal gate set operation on a binomial bosonic logical qubit
Logical qubit encoding and quantum error correction (QEC) protocols have been experimentally demonstrated in various physical systems with multiple physical qubits, generally without reaching the…
The experimental realization of high-fidelity ‘shortcut-to-adiabaticity’ quantum gates in a superconducting Xmon qubit
Based on a `shortcut-to-adiabaticity' (STA) scheme, we theoretically design and experimentally realize a set of high-fidelity single-qubit quantum gates in a superconducting Xmon qubit system.…
Perfect quantum state transfer in a superconducting qubit chain with parametrically tunable couplings.
Faithfully transferring the quantum state is essential for quantum information processing. Here we demonstrate a fast (in 84 ns) and high-fidelity (99.2%) transfer of arbitrary quantum states in a…
A twofold quantum delayed-choice experiment in a superconducting circuit
This work suggests and implements a conceptually different quantum delayed-choice experiment by introducing a which-path detector (WPD) that can simultaneously record and neglect the system’s path information, but where the interferometer itself is classical.
Experimental Quantum Randomness Processing Using Superconducting Qubits.
The experiment shows the advantage of using quantum coherence of a single qubit for information processing even when multipartite correlation is not present, as well as exploiting the high-fidelity quantum state preparation and measurement with a superconducting qubit in the circuit quantum electrodynamic architecture and a nearly quantum-limited parametric amplifier.
Observation of Topological Magnon Insulator States in a Superconducting Circuit.
This experiment experimentally realizes a tunable dimerized spin chain model and observes the topological magnon insulator states in a superconducting qubit chain and exhibits the great potential of tunable super Conducting Qubit chain as a versatile platform for exploring noninteracting and interacting symmetry-protected topological states.