419 citations · 2.6k across the 57 of their papers we have counts for
45 papers · 1 filter
Frequency-resolved decoherence spectroscopy of a semiconductor charge qubit coupled to a high-impedance resonator
Ekaterina Al-Tavil, Wonjin Jang, David J. van Woerkom +10
Superconducting resonators coupled to semiconductor quantum dots provide a powerful platform to investigate light-matter interaction and decoherence mechanisms in solid-state quant…
Near-Unity Charge Readout in a Nonlinear Resonator without Matching
Harald Havir, Andrea Cicovic, Pierre Glidic +4
Dissipative sensors typically use linear resonators with impedance matching to achieve maximal signal and fast operation. The impedance matching, however, sets an upper limit to th…
Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector
Subhomoy Haldar, Morten Munk, Harald Havir +7
We investigate experimentally the quantum coherence of an electronic two-level system in a double quantum dot under continuous charge detection. The charge-state of the two-level s…
High-efficiency microwave photodetection by cavity coupled double dots with single cavity-photon sensitivity
Subhomoy Haldar, Harald Havir, Waqar Khan +6
We present a superconducting cavity-coupled double quantum dot (DQD) photodiode that achieves a maximum photon-to-electron conversion efficiency of 25% in the microwave domain. Wit…
A coherence sweet spot with enhanced dipolar coupling
Jann H. Ungerer, Alessia Pally, Stefano Bosco +9
Qubits require a compromise between operation speed and coherence. Here, we demonstrate a compromise-free singlet-triplet (ST) qubit, where the qubit couples maximally to the drivi…
Heat transport at the nanoscale and ultralow temperatures -- implications for quantum technologies
Danial Majidi, Justin P. Bergfield, Ville Maisi +3
In this perspective, we discuss thermal imbalance and the associated electron-mediated thermal transport in quantum electronic devices at very low temperatures. We first present th…
Hot Carrier Nanowire Transistors at the Ballistic Limit
M. Kumar, A. Nowzari, A. R. Persson +7
We demonstrate experimentally non-equilibrium transport in unipolar quasi-1D hot electron devices reaching ballistic limit. The devices are realized with heterostructure engineerin…
Continuous microwave photon counting by semiconductor-superconductor hybrids
Subhomoy Haldar, David Barker, Harald Havir +4
The growing interest in quantum information has enabled the manipulation and readout of microwave photon states with high fidelities. The presently available microwave photon count…
Dephasing in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator
Antti Ranni, Subhomoy Haldar, Harald Havir +8
Dephasing of a charge qubit is usually credited to charge noise in the environment. Here we show that charge noise may not be the limiting factor for the qubit coherence. To this e…
Microwave power harvesting using resonator-coupled double quantum dot photodiode
Subhomoy Haldar, Drilon Zenelaj, Patrick P. Potts +5
We demonstrate a microwave power-to-electrical energy conversion in a resonator-coupled double quantum dot. The system, operated as a photodiode, converts individual microwave phot…
High Impedance Josephson Junction Resonators in the Transmission Line Geometry
Antti Ranni, Harald Havir, Subhomoy Haldar +1
In this article we present an experimental study of microwave resonators made out of Josephson junctions. The junctions are embedded in a transmission line geometry so that they in…
Quantum Dot Source-Drain Transport Response at Microwave Frequencies
Harald Havir, Subhomoy Haldar, Waqar Khan +5
Quantum dots are frequently used as charge sensitive devices in low temperature experiments to probe electric charge in mesoscopic conductors where the current running through the…
Strong coupling between a microwave photon and a singlet-triplet qubit
Jann H. Ungerer, Alessia Pally, Artem Kononov +9
Tremendous progress in few-qubit quantum processing has been achieved lately using superconducting resonators coupled to gate voltage defined quantum dots. While the strong couplin…
Minimally dissipative information erasure in a quantum dot via thermodynamic length
Matteo Scandi, David Barker, Sebastian Lehmann +3
In this work we explore the use of thermodynamic length to improve the performance of experimental protocols. In particular, we implement Landauer erasure on a driven electron leve…
Energetics of microwaves probed by double quantum dot absorption
Subhomoy Haldar, Harald Havir, Waqar Khan +4
We explore the energetics of microwaves interacting with a double quantum dot photodiode and show wave-particle aspects in photon-assisted tunneling. The experiments show that the…
Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island
H. Q. Nguyen, D. Sabonis, D. Razmadze +8
The performance of superconducting devices is often degraded by the uncontrolled appearance and disappearance of quasiparticles, a process known as poisoning. We demonstrate electr…
Local and non-local two-electron tunneling processes in a Cooper pair splitter
Antti Ranni, Elsa T. Mannila, Axel Eriksson +3
We measure the tunneling rates and coupling coefficients for local Andreev, non-local Andreev and elastic cotunneling processes. The non-local Andreev process, giving rise to Coope…
Experimental verification of the work fluctuation-dissipation relation for information-to-work conversion
David Barker, Matteo Scandi, Sebastian Lehmann +4
We study experimentally work fluctuations in a Szilard engine that extracts work from information encoded as the occupancy of an electron level in a semiconductor quantum dot. We s…
Quantum confinement suppressing electronic heat flow below the Wiedemann-Franz law
D. Majidi, M. Josefsson, M. Kumar +5
The Wiedemann-Franz law states that the charge conductance and the electronic contribution to the heat conductance are proportional. This sets stringent constraints on efficiency b…
Real-time observation of Cooper pair splitting showing strong non-local correlations
Antti Ranni, Fredrik Brange, Elsa T. Mannila +2
Controlled generation and detection of quantum entanglement between spatially separated particles constitute an essential prerequisite both for testing the foundations of quantum m…
Efficient and Continuous Microwave Photodetection in Hybrid Cavity-Semiconductor Nanowire Double Quantum Dot Diodes
Waqar Khan, Patrick P. Potts, Sebastian Lehmann +4
Single photon detectors are key for time-correlated photon counting applications [1] and enable a host of emerging optical quantum information technologies [2]. So far, the leading…
Maxwell's demon in a double quantum dot with continuous charge detection
Björn Annby-Andersson, Peter Samuelsson, Ville F. Maisi +1
Converting information into work has during the last decade gained renewed interest as it gives insight into the relation between information theory and thermodynamics. Here we the…
Individually addressable double quantum dots formed with nanowire polytypes and identified by epitaxial markers
David Barker, Sebastian Lehmann, Luna Namazi +4
Double quantum dots (DQDs) hold great promise as building blocks for quantum technology as they allow for two electronic states to coherently couple. Defining QDs with materials ra…
Detecting parity effect in a superconducting device in the presence of parity switches
E. T. Mannila, V. F. Maisi, H. Q. Nguyen +2
We present a superconducting device showing a clear parity effect in the number of electrons, even when there is, on average, a single nonequilibrium quasiparticle present and the…