Publications (14)
Robust preparation of Wigner-negative states with optimized SNAP-displacement sequences
Marina Kudra, Mikael Kervinen, Ingrid Strandberg +13
Hosting non-classical states of light in three-dimensional microwave cavities has emerged as a promising paradigm for continuous-variable quantum information processing. Here we ex…
Multipartite entanglement in a microwave frequency comb
Shan W. Jolin, Gustav Andersson, J. C. Rivera Hernández +6
Significant progress has been made with multipartite entanglement of discrete qubits, but continuous variable systems may provide a more scalable path toward entanglement of large…
Simple, reliable and noise-resilient continuous-variable quantum state tomography with convex optimization
Ingrid Strandberg
Precise reconstruction of unknown quantum states from measurement data, a process commonly called quantum state tomography, is a crucial component in the development of quantum inf…
PennyLane: Automatic differentiation of hybrid quantum-classical computations
Ville Bergholm, Josh Izaac, Maria Schuld +65
PennyLane is a Python 3 software framework for differentiable programming of quantum computers. The library provides a unified architecture for near-term quantum computing devices,…
Steady-state generation of Wigner negative states in 1D resonance fluorescence
Fernando QuijandrÃa, Ingrid Strandberg, Göran Johansson
In this work we demonstrate numerically that the nonlinearity provided by a continuously driven two-level system (TLS) allows for the generation of Wigner-negative states of the el…
Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit
Yong Lu, Ingrid Strandberg, Fernando QuijandrÃa +3
We experimentally demonstrate the steady-state generation of propagating Wigner-negative states from a continuously driven superconducting qubit. We reconstruct the Wigner function…
Deterministic generation of frequency-bin-encoded microwave photons
Jiaying Yang, Maryam Khanahmadi, Ingrid Strandberg +7
A distributed quantum computing network requires a quantum communication channel between spatially separated processing units. In superconducting circuits, such a channel can be im…
Numerical study of Wigner negativity in one-dimensional steady-state resonance fluorescence
Ingrid Strandberg, Yong Lu, Fernando QuijandrÃa +1
In a numerical study, we investigate the steady-state generation of nonclassical states of light from a coherently driven two-level atom in a one-dimensional waveguide. Specificall…
Deterministic generation of shaped single microwave photons using a parametrically driven coupler
Jiaying Yang, Axel Eriksson, Mohammed Ali Aamir +5
A distributed quantum computing system requires a quantum communication channel between spatially separated processing units. In superconducting circuits, such a channel can be rea…
Wigner negativity in the steady-state output of a Kerr parametric oscillator
Ingrid Strandberg, Göran Johansson, Fernando QuijandrÃa
The output field from a continuously driven linear parametric oscillator may exhibit considerably more squeezing than the intracavity field. Inspired by this fact, we explore the n…
Entanglement of photonic modes from a continuously driven two-level system
Jiaying Yang, Ingrid Strandberg, Alejandro Vivas-Viana +7
The ability to generate entangled states of light is a key primitive for quantum communication and distributed quantum computation. Continuously driven sources, including those bas…
Digital homodyne and heterodyne detection for stationary bosonic modes
Ingrid Strandberg, Axel Eriksson, Baptiste Royer +2
Homo- and heterodyne detection are fundamental techniques for measuring propagating electromagnetic fields. However, applying these techniques to stationary fields confined in cavi…
Overhead in Quantum Circuits with Time-Multiplexed Qubit Control
Marvin Richter, Ingrid Strandberg, Simone Gasparinetti +1
When scaling up quantum processors in a cryogenic environment, it is desirable to limit the number of qubit drive lines going into the cryostat, since fewer lines makes cooling of…
Dynamical excitation control and multimode emission of an atom-photon bound state
Claudia Castillo-Moreno, Kazi Rafsanjani Amin, Ingrid Strandberg +3
Atom-photon bound states arise from the coupling of quantum emitters to the band edge of dispersion-engineered waveguides. Thanks to their tunable-range interactions, they are prom…