In-situ scanning gate imaging of individual two-level material defects in live superconducting quantum circuits
- URL: http://arxiv.org/abs/2408.16660v1
- Date: Thu, 29 Aug 2024 16:04:43 GMT
- Title: In-situ scanning gate imaging of individual two-level material defects in live superconducting quantum circuits
- Authors: M. Hegedüs, R. Banerjee, A. Hutcheson, T. Barker, S. Mahashabde, A. V. Danilov, S. E. Kubatkin, V. Antonov, S. E. de Graaf,
- Abstract summary: Two-level system defects (TLS) govern the low temperature physics of structurally amorphous materials.
Recent advances towards realising stable high-coherence platforms for quantum computing has increased the importance of studying TLS in solid-state quantum circuits.
Here we perform scanning gate microscopy on a live superconducting quantum circuit at millikelvin temperatures to locate individual TLS.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: The low temperature physics of structurally amorphous materials is governed by two-level system defects (TLS), the exact origin and nature of which remain elusive despite decades of study. Recent advances towards realising stable high-coherence platforms for quantum computing has increased the importance of studying TLS in solid-state quantum circuits, as they are a persistent source of decoherence and instability. Here we perform scanning gate microscopy on a live superconducting quantum circuit at millikelvin temperatures to locate individual TLS. Our method directly reveals the microscopic nature of TLS and is also capable of deducing the three dimensional orientation of individual TLS electric dipole moments. Such insights, when combined with structural information of the underlying materials, can help unravel the detailed microscopic nature and chemical origin of TLS, directing strategies for their eventual mitigation.
Related papers
- Phonon engineering of atomic-scale defects in superconducting quantum
circuits [5.596598303356484]
tunneling two-level systems (TLS) have taken on further relevance in the field of quantum computing.
We take a new approach that seeks to directly modify the properties of TLS through nanoscale-engineering.
Our work paves the way for in-depth investigation and coherent control of TLS.
arXiv Detail & Related papers (2023-10-05T22:17:09Z) - Database of semiconductor point-defect properties for applications in
quantum technologies [54.17256385566032]
We have calculated over 50,000 point defects in various semiconductors including diamond, silicon carbide, and silicon.
We characterize the relevant optical and electronic properties of these defects, including formation energies, spin characteristics, transition dipole moments, zero-phonon lines.
We find 2331 composite defects which are stable in intrinsic silicon, which are then filtered to identify many new optically bright telecom spin qubit candidates and single-photon sources.
arXiv Detail & Related papers (2023-03-28T19:51:08Z) - Electromagnetically induced transparency in inhomogeneously broadened
divacancy defect ensembles in SiC [52.74159341260462]
Electromagnetically induced transparency (EIT) is a phenomenon that can provide strong and robust interfacing between optical signals and quantum coherence of electronic spins.
We show that EIT can be established with high visibility also in this material platform upon careful design of the measurement geometry.
Our work provides an understanding of EIT in multi-level systems with significant inhomogeneities, and our considerations are valid for a wide array of defects in semiconductors.
arXiv Detail & Related papers (2022-03-18T11:22:09Z) - Quantum states interrogation using a pre-shaped free electron
wavefunction [1.5078167156049138]
We present a theory for interrogation of the quantum state of a two-level system (TLS) based on a free-electron - bound-electron resonant interaction scheme.
The exceptional advantage of this scheme over laser-based ones is the atomic-scale spatial resolution of addressing individual TLS targets.
arXiv Detail & Related papers (2021-11-25T15:37:56Z) - Experimentally revealing anomalously large dipoles in a quantum-circuit
dielectric [50.591267188664666]
Two-level systems (TLSs) intrinsic to glasses induce decoherence in many modern quantum devices.
We show the existence of two distinct ensembles of TLSs, interacting weakly and strongly with phonons.
Results may shed new light on the low temperature characteristics of amorphous solids.
arXiv Detail & Related papers (2021-10-20T19:42:22Z) - TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting
Resonators [48.7576911714538]
Superconducting qubits have emerged as a potentially foundational platform technology.
Material quality and interfacial structures continue to curb device performance.
Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
arXiv Detail & Related papers (2021-08-30T22:22:47Z) - Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits.
We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films.
Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
arXiv Detail & Related papers (2020-11-29T09:57:50Z) - Circuit Quantum Electrodynamics [62.997667081978825]
Quantum mechanical effects at the macroscopic level were first explored in Josephson junction-based superconducting circuits in the 1980s.
In the last twenty years, the emergence of quantum information science has intensified research toward using these circuits as qubits in quantum information processors.
The field of circuit quantum electrodynamics (QED) has now become an independent and thriving field of research in its own right.
arXiv Detail & Related papers (2020-05-26T12:47:38Z) - Two-level systems in superconducting quantum devices due to trapped
quasiparticles [0.0]
We show that non-equilibrium quasiparticles can induce qubit relaxation in superconducting quantum circuits.
Our results imply that trapped QPs can induce qubit relaxation.
arXiv Detail & Related papers (2020-04-06T08:38:28Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.