Optimization of the resonator-induced phase gate for superconducting
qubits
- URL: http://arxiv.org/abs/2110.01724v1
- Date: Mon, 4 Oct 2021 21:27:02 GMT
- Title: Optimization of the resonator-induced phase gate for superconducting
qubits
- Authors: Moein Malekakhlagh, William Shanks and Hanhee Paik
- Abstract summary: We study the physics of weakly anharmonic transmon qubits coupled to linear resonators.
We show this type of leakage can be substantially suppressed using very weakly anharmonic transmons.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The resonator-induced phase gate is a two-qubit operation in which driving a
bus resonator induces a state-dependent phase shift on the qubits equivalent to
an effective $ZZ$ interaction. In principle, the dispersive nature of the gate
offers flexibility for qubit parameters. However, the drive can cause resonator
and qubit leakage, the physics of which cannot be fully captured using either
the existing Jaynes-Cummings or Kerr models. In this paper, we adopt an
ab-initio model based on Josephson nonlinearity for transmon qubits. The
ab-initio analysis agrees well with the Kerr model in terms of capturing the
effective $ZZ$ interaction in the weak-drive dispersive regime. In addition,
however, it reveals numerous leakage transitions involving high-excitation
qubit states. We analyze the physics behind such novel leakage channels,
demonstrate the connection with specific qubits-resonator frequency collisions,
and lay out a plan towards device parameter optimization. We show this type of
leakage can be substantially suppressed using very weakly anharmonic transmons.
In particular, weaker qubit anharmonicity mitigates both collision density and
leakage amplitude, while larger qubit frequency moves the collisions to occur
only at large anharmonicity not relevant to experiment. Our work is broadly
applicable to the physics of weakly anharmonic transmon qubits coupled to
linear resonators. In particular, our analysis confirms and generalizes the
measurement-induced state transitions noted in Sank et al. (Phys. Rev. Lett.
117, 190503) and lays the groundwork for both strong-drive resonator-induced
phase gate implementation and strong-drive dispersive qubit measurement.
Related papers
- The quantromon: A qubit-resonator system with orthogonal qubit and readout modes [2.516358999617711]
We introduce a two-mode circuit, nicknamed quantromon, with two modes implementing a qubit and a resonator.
Experiments implemented in a hybrid 2D-3D cQED architecture demonstrate some unique features of the quantromon.
arXiv Detail & Related papers (2025-01-29T06:41:29Z) - Impact of Josephson junction array modes on fluxonium readout [0.0]
We theoretically analyze measurement-induced state transitions (MIST) during the dispersive readout of a fluxonium qubit.
We show that these new kinds of MIST processes can be relevant when using realistic circuit parameters and relatively low readout drive powers.
arXiv Detail & Related papers (2024-12-19T12:28:46Z) - Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide.
When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits.
We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
arXiv Detail & Related papers (2024-08-30T15:54:33Z) - Quantum emulation of the transient dynamics in the multistate
Landau-Zener model [50.591267188664666]
We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity.
Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
arXiv Detail & Related papers (2022-11-26T15:04:11Z) - A driven quantum superconducting circuit with multiple tunable
degeneracies [0.0]
We present the experimental discovery of multiple simultaneous degeneracies in the spectrum of a Kerr oscillator subjected to a squeezing drive.
Remarkably, these degeneracies can be turned on-and-off on demand, and their number is tunable.
arXiv Detail & Related papers (2022-11-08T23:15:29Z) - Reminiscence of classical chaos in driven transmons [117.851325578242]
We show that even off-resonant drives can cause strong modifications to the structure of the transmon spectrum rendering a large part of it chaotic.
Results lead to a photon number threshold characterizing the appearance of chaos-induced quantum demolition effects.
arXiv Detail & Related papers (2022-07-19T16:04:46Z) - Dynamics of Transmon Ionization [94.70553167084388]
We numerically explore the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives.
We find clear signatures of transmon ionization where the qubit escapes out of its cosine potential.
arXiv Detail & Related papers (2022-03-21T18:00:15Z) - Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors.
Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction.
We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
arXiv Detail & Related papers (2021-07-21T03:03:13Z) - Designing Kerr Interactions for Quantum Information Processing via
Counterrotating Terms of Asymmetric Josephson-Junction Loops [68.8204255655161]
static cavity nonlinearities typically limit the performance of bosonic quantum error-correcting codes.
Treating the nonlinearity as a perturbation, we derive effective Hamiltonians using the Schrieffer-Wolff transformation.
Results show that a cubic interaction allows to increase the effective rates of both linear and nonlinear operations.
arXiv Detail & Related papers (2021-07-14T15:11:05Z) - Dynamical sweet spot engineering via two-tone flux modulation of
superconducting qubits [0.0]
We experimentally demonstrate that two-tone flux modulation can be used to create a continuum of dynamical sweet spots.
The ability to use flux control to freely select qubit frequencies while maintaining qubit coherence represents an important step forward in the robustness and scalability of near-term superconducting qubit devices.
arXiv Detail & Related papers (2021-04-16T00:54:46Z)
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.