252 citations · 616 across the 12 of their papers we have counts for
12 papers
Programmable generation of flying cat-qubits
Cecilia Erneman, Zeidan Zeidan, Göran Johansson +1
We propose a framework for the direct generation of flying cat-qubit states from vacuum using time-dependent two-photon drives in nonlinear bosonic systems. We study both Kerr-base…
Superbunching from coherently driven atoms in a waveguide
Zeidan Zeidan, Therese Karmstrand, Maryam Khanahmadi +1
We investigate the scattered field from identical two-level atoms resonantly driven by a weak coherent field in a one-dimensional waveguide. For atoms separated by the drive wa…
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…
Successive quasienergy collapse and breakdown of photon blockade in the few-emitter limit
T. Karmstrand, G. Johansson, R. Gutiérrez-Jáuregui
The emergent behavior that arises in many-body systems of increasing size follows universal laws that become apparent in order-to-disorder transitions. While this behavior has been…
The Multimode Character of Quantum States Released from a Superconducting Cavity
Maryam Khanahmadi, Mads Middelhede Lund, Klaus Mølmer +1
Quantum state transfer by propagating wave packets of electromagnetic radiation requires tunable couplings between the sending and receiving quantum systems and the propagation cha…
Impact of decoherence on the fidelity of quantum gates leaving the computational subspace
Tahereh Abad, Yoni Schattner, Anton Frisk Kockum +1
The fidelity of quantum operations is often limited by incoherent errors, which typically can be modeled by fundamental Markovian noise processes such as amplitude damping and deph…
Building Blocks of a Flip-Chip Integrated Superconducting Quantum Processor
Sandoko Kosen, Hang-Xi Li, Marcus Rommel +24
We have integrated single and coupled superconducting transmon qubits into flip-chip modules. Each module consists of two chips -- one quantum chip and one control chip -- that are…
Unconventional saturation effects at intermediate drive in a lossy cavity coupled to few emitters
Therese Karmstrand, Benjamin Rousseaux, Anton Frisk Kockum +2
Recent technological advancements have enabled strong light-matter interaction in highly dissipative cavity-emitter systems. However, in these systems, which are well described by…
Wigner negativity in the steady-state output of a Kerr parametric oscillator
Ingrid Strandberg, Göran Johansson, Fernando Quijandría
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…
The giant acoustic atom -- a single quantum system with a deterministic time delay
Lingzhen Guo, Arne Grimsmo, Anton Frisk Kockum +2
We investigate the quantum dynamics of a single transmon qubit coupled to surface acoustic waves (SAWs) via two distant connection points. Since the acoustic speed is five orders o…
Simple, robust and on-demand generation of single and correlated photons
Sankar Raman Sathyamoorthy, Andreas Bengtsson, Steven Bens +3
We propose two different setups to generate single photons on demand using an atom in front of a mirror, along with either a beam-splitter or a tunable coupling. We show that photo…
Designing frequency-dependent relaxation rates and Lamb shift for a giant artificial atom
Anton Frisk Kockum, Per Delsing, Göran Johansson
In traditional quantum optics, where the interaction between atoms and light at optical frequencies is studied, the atoms can be approximated as point-like when compared to the wav…