Two-qubit decoherence mechanisms revealed via quantum process tomography

Abstract

We analyze the quantum process tomography (QPT) in the presence of decoherence, focusing on distinguishing local and non-local decoherence mechanisms for a two-partite system from experimental QPT data. In particular, we consider the $\sqrt{\mathrm{iSWAP}}$ gate realized with superconducting phase qubits and calculate the QPT matrix $\chi$ in the presence of several local and non-local decoherence processes. We determine specific patterns of these decoherence processes, which can be used for a fast identification of the main decoherence mechanisms from an experimental $\chi$-matrix.

15 pages

References in corpus (12)

• Finite-Time Disentanglement via Spontaneous Emission
• Quantum Open System Theory: Bipartite Aspects
• Assessing non-Markovian dynamics
• Quantum Process Tomography: Resource Analysis of Different Strategies
• Realization of the quantum Toffoli gate with trapped ions
• Symmetrised Characterisation of Noisy Quantum Processes
• Process tomography of ion trap quantum gates
• Production and detection of entangled electron-hole pairs in a degenerate electron gas
• Quantum process tomography and Linblad estimation of a solid state qubit
• Bell inequality violation versus entanglement in presence of local decoherence
• Equation of motion for process matrix: Hamiltonian identification and dynamical control of open quantum systems
• Direct Estimation of Single- and Two-Qubit Hamiltonians and Relaxation Rates

Cited by in corpus (26)

• Implementing the Quantum von Neumann Architecture with Superconducting Circuits
• Quantum Process Tomography of a Universal Entangling Gate Implemented with Josephson Phase Qubits
• Digital quantum simulation of spin models with circuit quantum electrodynamics
• Efficient measurement of quantum dynamics via compressive sensing
• Characterization of a two-transmon processor with individual single-shot qubit readout
• Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits
• Experimental quantum process tomography of non trace-preserving maps
• Quantum State and Process Tomography of Energy Transfer Systems via Ultrafast Spectroscopy
• Compressed sensing quantum process tomography for superconducting quantum gates
• Experimental Demonstration of Non-local Controlled-Unitary Quantum Gates Using a Five-qubit Quantum Computer
• Quantum process reconstruction based on mutually unbiased basis
• Experimental demonstration of selective quantum process tomography on an NMR quantum information processor
• Gradient-descent quantum process tomography by learning Kraus operators
• Quantum Process Tomography of a Molmer-Sorensen Interaction
• Implementing efficient selective quantum process tomography of superconducting quantum gates on the IBM quantum processor
• Learning Noise via Dynamical Decoupling of Entangled Qubits
• Superbradyons and some possible dark matter signatures
• Preon models, relativity, quantum mechanics and cosmology (I)
• Bacon-Shor code with continuous measurement of non-commuting operators
• Quantum process tomography of a Mølmer-Sørensen gate via a global beam
• Machine learning of quantum channels on NISQ devices
• Experimental characterization of quantum processes: a selective and efficient method in arbitrary finite dimension
• True experimental reconstruction of quantum states and processes via convex optimization
• The Origin of Separable States and Separability Criteria from Entanglement-breaking Channels
• Spectral Transfer Tensor Method for Non-Markovian Noise Characterization
• Quantum Process Tomography with Digital Twins of Error Matrices