Realistic quantum manipulation of two-level system fluctuators

Abstract

Two-level system fluctuators in superconducting devices have demonstrated coherent coupling with superconducting qubits. Here, we show that universal quantum logic gates can be realized in these two-level systems solely by tuning a superconducting resonator in which they are imbedded. Because of the large energy separation between the fluctuators, conventional gate schemes in the cavity QED approach that are widely used for solid-state qubits cannot be directly applied to the fluctuators. We study a scheme to perform the gate operations by exploiting the controllability of the superconducting resonator with realistic parameters. Numerical simulation that takes into account the decay of the resonator mode shows that the quantum logic gates can be realized with high fidelity at moderate resonator decay rate. The quantum logic gates can also be realized between fluctuators inside different Josephson junctions that are connected by a superconducting loop. Our scheme can be applied to explore the coupling between two-level system fluctuators and superconducting resonators as well as the coherent properties of the fluctuators.

6 pages, 3 figures, submitted

References in corpus (32)

• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Quantum state engineering with Josephson-junction devices
• Coupling Superconducting Qubits via a Cavity Bus
• Superconducting Circuits and Quantum Information
• Decoherence in Josephson Qubits from Dielectric Loss
• Coherent dynamics of a flux qubit coupled to a harmonic oscillator
• Quantum information processing with circuit quantum electrodynamics
• A simple formula for the average gate fidelity of a quantum dynamical operation
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Generating Single Microwave Photons in a Circuit
• Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit
• Decoherence in Josephson Qubits from Junction Resonances
• Quantum information processing with superconducting qubits in a microwave field
• Single artificial-atom lasing
• Quantum non-demolition measurement of a superconducting two-level system
• Model for l/f Flux Noise in SQUIDs and Qubits
• Low- and high-frequency noise from coherent two-level systems
• Decoherence in Josephson-junction qubits due to critical current fluctuations
• Microwave-Induced Cooling of a Superconducting Qubit
• Quantum two-level systems in Josephson junctions as naturally formed qubits
• Temperature square dependence of the low frequency 1/f charge noise in the Josephson junction qubits
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Microscopic Model of Critical Current Noise in Josephson Junctions
• Anomalous avoided level crossings in a Cooper-pair box spectrum
• Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction
• Quantum Jumps between Macroscopic Quantum States of a Superconducting Qubit Coupled to a Microscopic Two-Level System
• Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity
• Frequency-Tunable Josephson Junction Resonator for Quantum Computing
• A Josephson Junction Microscope for Low-frequency Fluctuators
• Decoherence in dc SQUID phase qubits

Cited by in corpus (4)

• Circuit QED and sudden phase switching in a superconducting qubit array
• Jaynes Cummings treatment of superconducting resonators with dielectric loss due to two-level systems
• Implementing Genuine Multi-Qubit Entanglement of Two-Level-System Inside a Superconducting Phase Qubit
• Dark Periods in Rabi Oscillations of Superconducting Phase Qubit Coupled to a Microscopic Two-Level System