Decoherence of charge qubit coupled to interacting background charges

Abstract

The major contribution to decoherence of a double quantum dot or a Josephson junction charge qubit comes from the electrostatic coupling to fluctuating background charges hybridized with the conduction electrons in the reservoir. However, estimations according to previously developed theories show that finding a sufficient number of effective fluctuators in a realistic experimental layout is quite improbable. We show that this paradox is resolved by allowing for a short-range Coulomb interaction of the fluctuators with the electrons in the reservoir. This dramatically enhances both the number of effective fluctuators and their contribution to decoherence, resulting in the most dangerous decoherence mechanism for charge qubits.

4 pages, 1 figure

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• Charge State Hysteresis in Semiconductor Quantum Dots
• Long distance coupling of resonant exchange qubits
• Spectral Analysis and Identification of Noises in Quantum Systems
• Retrieving qubit information despite decoherence
• Temporal evolution of resonant transmission under telegraph noise
• Electron temperature in electrically isolated Si double quantum dots
• Dynamics of spin-flip photon-assisted tunneling
• Telegraph noise effects on two charge-qubits in double quantum dots
• Heat currents in electronic junctions driven by telegraph noise
• Decoherence by electromagnetic fluctuations in double-quantum-dot charge qubits
• Modeling of Low and High Frequency Noise by Slow and Fast Fluctuators
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• Decoherence and the retrieval of lost information
• Neural Network Based Qubit Environment Characterization
• Suppression of dephasing and phase lapses in the fractional quantum Hall regime