Qubit relaxation from evanescent-wave Johnson noise

Abstract

In many quantum computer architectures, the qubits are in close proximity to metallic device elements. Metals have a high density of photon modes, and the fields spill out of the bulk metal because of the evanescent-wave component. Thus thermal and quantum electromagnetic Johnson- type noise from metallic device elements can decohere nearby qubits. In this paper we use quantum electrodynamics to compute the strength of this evanescent-wave Johnson noise as a function of distance z from a metallic half-space. Previous treatments have shown unphysical divergences at z = 0. We remedy this by using a proper non-local dielectric function. Decoherence rates of local qubits are proportional to the magnitude of electric or magnetic correlation functions evaluated at the qubit position. We present formulas for the decoherence rates. These formulas serve as an important constraint on future device architectures.

5 pages, 4 figures

References in corpus (8)

• Single-shot read-out of an individual electron spin in a quantum dot
• Surface Electromagnetic Waves Thermally Excited: Radiative Heat Transfer, Coherence Properties and Casimir Forces Revisited in the Near Field
• Loss and heating of particles in small and noisy traps
• Hyperfine-mediated transitions between a Zeeman split doublet in GaAs quantum dots: The role of the internal field
• Measurement of the Spin Relaxation Time of Single Electrons in a Silicon MOS-Based Quantum Dot
• Electromagnetic field correlations near a surface with a nonlocal optical response
• Spin Relaxation in a Quantum Dot due to Nyquist Noise
• Decoherence by electromagnetic fluctuations in double-quantum-dot charge qubits

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