Abstract
The loss and noise mechanisms of superconducting resonators are useful tools for understanding decoherence in superconducting circuits. While the loss mechanisms have been heavily studied, noise in superconducting resonators has only recently been investigated. In particular, there is an absence of literature on noise in the single photon limit. Here, we measure the loss and noise of an aluminium on silicon quarter-wavelength (λ/4) resonator in the single photon regime.
Highlights
Over the past decade it has become clear that the main causes of decoherence in quantum circuits are bad microwave engineering, excess quasiparticles and parasitic two level systems (TLS)
When α = 1, the first term represents a true flicker noise process. From this fit we find that the white noise level is described by h0 = 2.5×10−16, while the flicker noise level is described by α = 1.05 and h−1 = 3.5×10−15
We measured frequency noise of a highQ superconducting resonator at single photon energies. This is an important step towards studies of the interacting nature of TLS, which are currently limiting the performance of many superconducting circuits
Summary
Over the past decade it has become clear that the main causes of decoherence in quantum circuits are bad microwave engineering, excess quasiparticles and parasitic two level systems (TLS). Within the context of superconducting devices, the interacting nature of TLS is revealed in the temperature dependence of 1/f noise[16,17,18,19,20]. These interactions result in TLS moving in and out of resonance with a superconducting device. We study the noise of this resonator at single photon energies This opens up the possibility of directly measuring noise in superconducting qubits as well as further examining the nature of interacting TLS which are the limiting factor for many quantum circuits
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