Loss of quantum coherence due to non-stationary glass fluctuations

Abstract

Low-temperature dynamics of insulating glasses is dominated by a macroscopic concentration of tunneling two-level systems (TTLS). The distribution of the switching/relaxation rates of TTLS is exponentially broad, which results in non-equilibrium state of the glass at arbitrarily long time-scales. Due to the electric dipolar nature, the switching TTLS generate fluctuating electromagnetic fields. We study the effect of the non-thermal slow fluctuators on the dephasing of a solid state qubit. We find that at low enough temperatures, non-stationary contribution can dominate the stationary (thermal) one, and discuss how this effect can be minimized.

arXiv comment4 pages

References in corpus (11)

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Heating of trapped ions from the quantum ground state
• Decoherence and 1/f noise in Josephson qubits
• Low-frequency noise as a source of dephasing of a qubit
• Non-Gaussian low-frequency noise as a source of qubit decoherence
• Low- and high-frequency noise from coherent two-level systems
• Decoherence in Josephson-junction qubits due to critical current fluctuations
• Decoherence from ensembles of two-level fluctuators
• Models of environment and T_1 relaxation in Josephson Charge Qubits
• Low-Temperature Decoherence of Qubit Coupled to Background Charges
• Ohmic and step noise from a single trapping center hybridized with a Fermi sea

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• Electrical operation of hole spin qubits in planar MOS silicon quantum dots