Protecting Superconducting Qubits with Universal Quantum Degeneracy Point
arXiv:1308.4926 · doi:10.1088/0953-2048/26/11/114002
Abstract
Low-frequency noise can induce serious decoherence in superconducting qubits. Due to its diverse physical origin, such noise can couple with the qubits either as transverse or as longitudinal noise. Here, we present a universal quantum degeneracy point approach that can protect an encoded qubit from arbitrary low-frequency noise. We further show that universal quantum logic gates can be performed on the encoded qubits with high fidelity. The proposed scheme can be readily implemented with superconducting flux qubits or with a qubit coupling with a superconducting resonator. Meanwhile, the scheme is also robust against small parameter spreads due to fabrication errors in the superconducting systems.
arXiv comment15 pages, 3 figures, submitted to the special issue on "Superconducting qubits: on the verge of scalability" in the Superconductor Science and Technology. This submission replaces arxiv:1101.2942
References in corpus (45)
- Charge insensitive qubit design derived from the Cooper pair box
- Quantum state engineering with Josephson-junction devices
- Decoherence Free Subspaces for Quantum Computation
- Manipulating the Quantum State of an Electrical Circuit
- Superconducting Circuits and Quantum Information
- Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
- Decoherence in Josephson Qubits from Dielectric Loss
- Fluxonium: single Cooper pair circuit free of charge offsets
- A Superconducting Persistent Current Qubit
- A simple formula for the average gate fidelity of a quantum dynamical operation
- Decoherence in a superconducting quantum bit circuit
- Decoherence of flux qubits due to 1/f flux noise
- Charge echo in a Cooper-pair box
- Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors
- Quantum noise in the Josephson charge qubit
- Microwave Dielectric Loss at Single Photon Energies and milliKelvin Temperatures
- Spectroscopy on two coupled flux qubits
- Model for l/f Flux Noise in SQUIDs and Qubits
- Dephasing of a superconducting flux qubit
- Dephasing of solid-state qubits at optimal points
- Decoherence in Josephson-junction qubits due to critical current fluctuations
- Improving the Coherence Time of Superconducting Coplanar Resonators
- Variable electrostatic transformer: controllable coupling of two charge qubits
- Controllable coupling between flux qubits
- Microscopic origin of low frequency flux noise in Josephson circuits
- Parametric coupling for superconducting qubits
- Tunable coupling scheme for flux qubits at the optimal point
- Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
- Dynamical suppression of 1/f noise processes in qubit systems
- Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator
- Dynamical Decoupling Using Slow Pulses: Efficient Suppression of 1/f Noise
- Temperature square dependence of the low frequency 1/f charge noise in the Josephson junction qubits
- Parametric coupling between macroscopic quantum resonators
- Geometrical dependence of low frequency noise in superconducting flux qubits
- Parametric control of a superconducting flux qubit
- Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction
- Dynamical decoupling and dephasing in interacting two-level systems
- Saturation of Two Level Systems and Charge Noise in Josephson Junction Qubits
- Effects of the quark field on the ghost propagator of Lattice Landau Gauge QCD
- Dielectric losses in multi-layer Josephson junction qubits
- Decoherence in dc SQUID phase qubits
- Modeling Flux Noise in SQUIDs Due to Hyperfine Interactions
- Entanglement dynamics of a superconducting phase qubit coupled to a two-level system
- Correcting low-frequency noise with continuous measurement
- Coupling mechanism between microscopic two-level system and superconducting qubits