Decoherence in a superconducting quantum bit circuit

By G. Ithier, E. Collin, P. Joyez, P. Meeson, D. Vion, D. Estève, F. Chiarello, A. Shnirman, Y. Makhlin, J. Schriefl and 1 more. 2005

550 citations recorded by the source corpus.

Decoherence in quantum bit circuits is presently a major limitation to their use for quantum computing purposes. We present experiments, inspired from NMR, that characterize decoherence in a particular superconducting quantum bit circuit, the quantronium. We introduce a general framework for the analysis of decoherence, based on the spectral densities of the noise sources coupled to the qubit. Analysis of our measurements within this framework indicates a simple model for the noise sources acting on the qubit. We discuss various methods to fight decoherence.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/6910b17551966ca23af6cceebb048cb54f5bda73

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Citations in the corpus

Noise spectroscopy through dynamical decoupling with a superconducting flux qubit (2011, background): “ω)2/2Ω (30) around the effective ﬁeld, which makes an angle η = arctan(∆ω/Ω) with the qubit’s σˆz axis. 17 The decay of the Rabi oscillations has contributions from noise at the frequencies ω01 and Ω [17], and from the low-frequency, quasi-static ﬂux noise with varianceσ2 ε. Static noise. We ﬁrst de”
Review of performance metrics of spin qubits in gated semiconducting nanostructures (2021, background): “(4) should be replaced by the corresponding quantities in the rotating reference frame [135].”
Tunable Superconducting Qubits with Flux-Independent Coherence (2017, methodology): “Thus, in this bias regime, the dephasing envelope is primarily Gaussian and the dephasing noise influencing the qubits is predominantly low frequency in nature with a 1=f-like spectrum [7,9].”
Single-shot qubit readout in circuit quantum electrodynamics (2009, methodology): “Another important figure of merit is the pure dephasing time Tφ [23] which controls the lifetime of a superposition of qubit states.”
Dynamical decoupling and noise spectroscopy with a superconducting flux qubit (2011, methodology): “5, as expected for 1/f noise [17], with an equivalent flux-noise amplitude [18]AΦ = (1.”
Superconducting quantum bits (2008, background): “The success of this optimum working point has been elegantly shown experimentall”
1 / f noise: Implications for solid-state quantum information (2013, methodology): “(87) In addition, consistently with θ̃q(t) ≈ θq, the splitting fluctuations are further approximated as (Falci et al., 2005; Ithier et al., 2005) δΩ‖(t) ≈ ∂Ω ∂q (δq) + 1 2 ∂2Ω ∂q2 (δq)2 + · · · .”