Process tomography of Robust Dynamical Decoupling in Superconducting Qubits

• URL: http://arxiv.org/abs/2006.10585v3
• Date: Fri, 4 Feb 2022 22:25:44 GMT
• Title: Process tomography of Robust Dynamical Decoupling in Superconducting Qubits
• Authors: Alexandre M. Souza
• Abstract summary: The Rigetti quantum computing platform was used to test different dynamical decoupling sequences. The performance of the sequences was characterized by Quantum Process Tomography and analyzed using the quantum channels formalism.
• Score: 91.3755431537592
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Dynamical decoupling is a technique that protects qubits against noise. The ability to preserve quantum coherence in the presence of noise is essential for the development of quantum devices. Here the Rigetti quantum computing platform was used to test different dynamical decoupling sequences. The performance of the sequences was characterized by Quantum Process Tomography and analyzed using the quantum channels formalism. It is shown that dynamical decoupling can reduce qubit dephasing but cannot protect against spontaneous emission. Furthermore, from process tomography results, it was also possible to conclude that the action of dynamical decoupling cannot be understood as a simple modification of the qubit coherence time. It is also shown here that the performance of dynamical decoupling on the Rigetti's qubits is limited by pulse imperfections. However, the performance can be improved using robust dynamical decoupling, i.e. sequences that are robust against experimental imperfections. The sequences tested here outperformed previous dynamical decoupling sequences tested in the same platform.

Related papers

• Speeding up Quantum Annealing with Engineered Dephasing [0.0]
  We show that engineered dephasing can enhance the adiabaticity of controlled quantum dynamics. We discuss the experimental feasibility of the protocols, and investigate the trade-off between fidelity and implementability.
  arXiv  Detail & Related papers  (2024-09-24T09:18:02Z)
• 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)
• Qudit-native measurement protocol for dynamical correlations using Hadamard tests [0.0]
  Dynamical correlations reveal important out-of-equilibrium properties of the underlying quantum many-body system. We propose a modified protocol to overcome this limitation by decomposing qudit observables into unitary operations. Our scheme can readily be implemented on various platforms and offers a wide range of applications.
  arXiv  Detail & Related papers  (2024-07-03T18:01:29Z)
• Learning How to Dynamically Decouple [0.40964539027092917]
  Current quantum computers suffer from noise that stems from interactions between the quantum system and its environment. We show that the performance of dynamical decoupling can be improved by optimizing its rotational gates to tailor them to the quantum hardware.
  arXiv  Detail & Related papers  (2024-05-14T15:11:39Z)
• Syncopated Dynamical Decoupling for Suppressing Crosstalk in Quantum Circuits [12.29963230632145]
  We study the use of dynamical decoupling in characterizing undesired two-qubit couplings and the underlying single-qubit decoherence. We develop a syncopated decoupling technique which protects against decoherence and selectively targets unwanted two-qubit interactions.
  arXiv  Detail & Related papers  (2024-03-12T17:18:35Z)
• Error-Mitigated Simulation of Quantum Many-Body Scars on Quantum Computers with Pulse-Level Control [0.0]
  We simulate the dynamics of an antiferromagnetic initial state in mixed-field Ising chains of up to 19 sites. We find coherent dynamics to persist over up to 40 Trotter steps even in the presence of various sources of error.
  arXiv  Detail & Related papers  (2022-03-15T22:12:25Z)
• Decimation technique for open quantum systems: a case study with driven-dissipative bosonic chains [62.997667081978825]
  Unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (non-unitary) dynamics. We introduce a method to deal with these systems based on the calculation of (dissipative) lattice Green's function. We illustrate the power of this method with several examples of driven-dissipative bosonic chains of increasing complexity.
  arXiv  Detail & Related papers  (2022-02-15T19:00:09Z)
• Unification of Random Dynamical Decoupling and the Quantum Zeno Effect [68.8204255655161]
  We show that the system dynamics under random dynamical decoupling converges to a unitary with a decoupling error that characteristically depends on the convergence speed of the Zeno limit. This reveals a unification of the random dynamical decoupling and the quantum Zeno effect.
  arXiv  Detail & Related papers  (2021-12-08T11:41:38Z)
• Quantum algorithms for quantum dynamics: A performance study on the spin-boson model [68.8204255655161]
  Quantum algorithms for quantum dynamics simulations are traditionally based on implementing a Trotter-approximation of the time-evolution operator. variational quantum algorithms have become an indispensable alternative, enabling small-scale simulations on present-day hardware. We show that, despite providing a clear reduction of quantum gate cost, the variational method in its current implementation is unlikely to lead to a quantum advantage.
  arXiv  Detail & Related papers  (2021-08-09T18:00:05Z)
• Pulse-level noisy quantum circuits with QuTiP [53.356579534933765]
  We introduce new tools in qutip-qip, QuTiP's quantum information processing package. These tools simulate quantum circuits at the pulse level, leveraging QuTiP's quantum dynamics solvers and control optimization features. We show how quantum circuits can be compiled on simulated processors, with control pulses acting on a target Hamiltonian.
  arXiv  Detail & Related papers  (2021-05-20T17:06:52Z)

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.