56 citations · 210 across the 14 of their papers we have counts for
14 papers
Singlet-triplet oscillations in multivalley Si double quantum dots
Łukasz Cywiński, Mats Volmer, Tom Struck +2
Charge separation from the to the state in a Si/SiGe double quantum dot is commonly used for initialization of spin qubits and Pauli-spin-blockade readout. It was u…
Statistical Structure of Charge Disorder in Si/SiGe Quantum Dots
Saeed Samadi, Łukasz Cywiński, Jan A. Krzywda
Properties of quantum dot based spin qubits have significant inter-device variability due to unavoidable presence of various types of disorder in semiconductor nanostructures. A si…
Phenomenological quantum mechanics: II. Deducing the formalism from experimental observations
Piotr Szańkowski, Davide Lonigro, Fattah Sakuldee +2
We propose an exercise in which one attempts to deduce the formalism of quantum mechanics solely from phenomenological observations. The only assumed inputs are the multi-time prob…
Phenomenological quantum mechanics: I. Phenomenology of quantum observables
Piotr Szańkowski, Davide Lonigro, Fattah Sakuldee +2
We propose an exercise in which one attempts to deduce the formalism of quantum mechanics solely from phenomenological observations. The only assumed inputs are obtained through se…
Double or nothing: a Kolmogorov extension theorem for multitime (bi)probabilities in quantum mechanics
Davide Lonigro, Fattah Sakuldee, Łukasz Cywiński +2
The multitime probability distributions obtained by repeatedly probing a quantum system via the measurement of an observable generally violate Kolmogorov's consistency property. Th…
Correlations of spin splitting and orbital fluctuations due to 1/f charge noise in the Si/SiGe Quantum Dot
Marcin Kępa, Łukasz Cywiński, Jan A. Krzywda
Fluctuations of electric fields can change the position of a gate-defined quantum dot in a semiconductor heterostructure. In the presence of magnetic field gradient, these stochast…
Objectivity of classical quantum stochastic processes
Piotr Szańkowski, Łukasz Cywiński
We investigate what can be concluded about a quantum system when sequential quantum measurements of its observable -- a prominent example of the so-called quantum stochastic proces…
Characterization of a quasi-static environment with a qubit
Fattah Sakuldee, Łukasz Cywiński
We consider a qubit initalized in a superposition of its pointer states, exposed to pure dephasing due to coupling to a quasi-static environment, and subjected to a sequence of sin…
Decoherence-assisted detection of entanglement of two qubit states
Jan Krzywda, Piotr Szańkowski, Jan Chwedeńczuk +1
We show that the decoherence, which in the long run destroys quantum features of a system, can be used to reveal the entanglement in a two-qubit system. To this end, we consider a…
Equivalence of qubit-environment entanglement and discord generation via pure dephasing interactions and the consequences thereof
Katarzyna Roszak, Łukasz Cywiński
We find that when a qubit initialized in a pure state experiences pure dephasing due to interaction with an environment, separable qubit-environment states generated during the evo…
Localization of a magnetic moment using a two-qubit probe
Jan Krzywda, Łukasz Cywiński, Piotr Szańkowski
A nanomagnet precessing in an external magnetic field can be treated as a source of narrow-bandwidth magnetic noise, that leaves characteristic fingerprints in decoherence of a nea…
Spectroscopy of cross-correlations of environmental noises with two qubits
Piotr Szańkowski, Marek Trippenbach, Łukasz Cywiński
A single qubit driven by an appropriate sequence of control pulses can serve as a spectrometer of local noise affecting its energy splitting. We show that by driving and observing…
In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots
Tomasz Smoleński, Tomasz Kazimierczuk, Mateusz Goryca +6
We demonstrate evidence for a radiative recombination channel of dark excitons in self-assembled quantum dots. This channel is due to a light hole admixture in the excitonic ground…
Magnetic polaron formation and exciton spin relaxation in single CdMnTe quantum dots
Łukasz Kłopotowski, Łukasz Cywiński, Piotr Wojnar +8
We study the formation dynamics of a spontaneous ferromagnetic order in single self-assembled CdMnTe quantum dots. By measuring time-resolved photoluminescence, we determine the fo…