# Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits

@article{Kaur2021SpinBosonQP, title={Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits}, author={Kuljeet Kaur and Th{\'e}o S{\'e}pulcre and Nicolas Roch and Izak M. Snyman and Serge Florens and Soumya Bera}, journal={Physical Review Letters}, year={2021} }

Superconducting circuits are currently developed as a versatile platform for the exploration of many-body physics, by building on non-linear elements that are often idealized as two-level qubits. A classic example is given by a charge qubit that is capacitively coupled to a transmission line, which leads to the celebrated spin-boson description of quantum dissipation. We show that the intrinsic multilevel structure of superconducting qubits drastically restricts the validity of the spinboson…

## References

SHOWING 1-10 OF 27 REFERENCES

Probing the strongly driven spin-boson model in a superconducting quantum circuit

- Physics, BiologyNature Communications
- 2018

It is shown that the drive reinforces environmental suppression of quantum coherence, and that a coherent-to-incoherent transition can be achieved by tuning the drive amplitude, and an out-of-equilibrium detailed balance relation is demonstrated.

A dissipatively stabilized Mott insulator of photons

- Physics, MedicineNature
- 2019

A versatile method for dissipative preparation of incompressible many-body phases through reservoir engineering is developed and used to stabilize a Mott insulator phase of photons trapped in a superconducting circuit, providing insights into thermalization processes in strongly correlated quantum matter.

Spectroscopic signatures of localization with interacting photons in superconducting qubits

- Physics, MedicineScience
- 2017

This work introduces a many-body spectroscopy technique based on a chain of superconducting qubits to study quantum phases of matter and introduces disorder to study the statistics of the energy levels of the system as it undergoes the transition from a thermalized to a localized phase.

Superconducting Qubits: Current State of Play

- Physics, Computer Science
- 2019

Several of the recent experimental advances in qubit hardware, gate implementations, readout capabilities, early NISQ algorithm implementations, and quantum error correction using superconducting qubits are discussed.

Quantum Networks in Divergence-free Circuit QED

- Physics
- 2017

Superconducting circuits are one of the leading quantum platforms for quantum technologies. With growing system complexity, it is of crucial importance to develop scalable circuit models that contain…

Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits

- Physics, MedicineNature Communications
- 2019

How many-body effects influence the zero-point motion of a Josephson junction coupled to a high impedance transmission line is observed, opening many exciting prospects for longstanding quests such as the tailoring of many- body Hamiltonians in the strongly non-linear regime, the observation of Bloch oscillations, or the development of high-impedance qubits.

Is there a no-go theorem for superradiant quantum phase transitions in cavity and circuit QED ?

- Physics
- 2010

In cavity quantum electrodynamics (QED), the interaction between an atomic transition and the cavity field is measured by the vacuum Rabi frequency Ω0. The analogous term ”circuit QED” has been…

Efficient modeling of superconducting quantum circuits with tensor networks

- Physicsnpj Quantum Information
- 2021

We use a tensor network method to compute the low-energy excitations of a large-scale fluxonium qubit up to a desired accuracy. We employ this numerical technique to estimate the pure-dephasing…

The quantum sine-Gordon model with quantum circuits

- PhysicsNuclear Physics B
- 2021

Analog quantum simulation has the potential to be an indispensable technique in the investigation of complex quantum systems. In this work, we numerically investigate a one-dimensional, faithful,…

Light-matter decoupling and A2 term detection in superconducting circuits

- Physics, MedicineScientific reports
- 2015

It is proved that an increase in the strength of the diamagnetic term leads to an effective decoupling of the qubit from the electromagnetic field, and that this effect is observable at any range of qubit-photon coupling.