Alex Zazunov
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View article: Green's function approach to Josephson dot dynamics and application to quantum Mpemba effects
Green's function approach to Josephson dot dynamics and application to quantum Mpemba effects Open
We develop a Green's function approach for the nonequilibrium dynamics of multilevel quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes b…
View article: Green's Function Approach to Josephson Dot Dynamics and Application to Quantum Mpemba Effects
Green's Function Approach to Josephson Dot Dynamics and Application to Quantum Mpemba Effects Open
We develop a Green's function approach for the nonequilibrium dynamics of multi-level quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes …
View article: Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field
Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field Open
We provide a theoretical framework to describe the quantum many-body dynamics of Andreev states in Josephson junctions with spin-orbit coupling and a magnetic Zeeman field. In such cases, employing a doubled Nambu spinor description is tec…
View article: Engineering unsteerable quantum states with active feedback
Engineering unsteerable quantum states with active feedback Open
We propose active steering protocols for quantum state preparation in quantum circuits where each system qubit is connected to a single detector qubit, employing a simple coupling selected from a small set of steering operators. The decisi…
View article: Engineering unsteerable quantum states with active feedback
Engineering unsteerable quantum states with active feedback Open
We propose active steering protocols for quantum state preparation in quantum circuits where each system qubit is connected to a single detector qubit, employing a simple coupling selected from a small set of steering operators. The decisi…
View article: Nonreciprocal charge transport and subharmonic structure in voltage-biased Josephson diodes
Nonreciprocal charge transport and subharmonic structure in voltage-biased Josephson diodes Open
We study charge transport in voltage-biased single-channel junctions involving helical superconductors with finite Cooper pair momentum. For a Josephson junction, the equilibrium current-phase relation shows a superconducting diode effect:…
View article: Approaching ideal rectification in superconducting diodes through multiple Andreev reflections
Approaching ideal rectification in superconducting diodes through multiple Andreev reflections Open
We analyze the rectification properties of voltage-biased Josephson junctions exhibiting the superconducting diode effect. Taking into account multiple Andreev reflection (MAR) processes in our scattering theory, we consider a short weak l…
View article: Dynamical parity selection in superconducting weak links
Dynamical parity selection in superconducting weak links Open
Excess quasiparticles play a crucial role in superconducting quantum devices ranging from qubits to quantum sensors. In this work we analyze their dynamics for phase-biased finite-length weak links with several Andreev subgap states, where…
View article: Dynamical parity selection in superconducting weak links
Dynamical parity selection in superconducting weak links Open
Excess quasiparticles play a crucial role in superconducting quantum devices ranging from qubits to quantum sensors. In this work we analyze their dynamics for phase-biased finite-length weak links with several Andreev subgap states, where…
View article: Driven Dissipative Majorana Dark Spaces
Driven Dissipative Majorana Dark Spaces Open
Pure quantum states can be stabilized in open quantum systems subject to external driving forces and dissipation by environmental modes. We show that driven dissipative (DD) Majorana devices offer key advantages for stabilizing degenerate …
View article: Towards dark space stabilization and manipulation in driven dissipative Majorana platforms
Towards dark space stabilization and manipulation in driven dissipative Majorana platforms Open
We propose driven dissipative Majorana platforms for the stabilization and\nmanipulation of robust quantum states. For Majorana box setups, in the presence\nof environmental electromagnetic noise and with tunnel couplings to quantum\ndots,…
View article: Theory of nonequilibrium noise in general multiterminal superconducting hybrid devices: Application to multiple Cooper pair resonances
Theory of nonequilibrium noise in general multiterminal superconducting hybrid devices: Application to multiple Cooper pair resonances Open
We consider the out-of-equilibrium behavior of a general class of mesoscopic\ndevices composed of several superconducting or/and normal metal leads separated\nby quantum dots. Starting from a microscopic Hamiltonian description, we\nprovid…
View article: Multi-particle interferometry in the time-energy domain with localized topological quasiparticles
Multi-particle interferometry in the time-energy domain with localized topological quasiparticles Open
We propose multi-particle interference protocols in the time-energy domain\nwhich are able to probe localized topological quasiparticles. Using a set of\nquantum dots tunnel-coupled to a topologically nontrivial system, the time\ndependenc…
View article: Boundary Green's function approach for spinful single-channel and multichannel Majorana nanowires
Boundary Green's function approach for spinful single-channel and multichannel Majorana nanowires Open
The boundary Green's function (bGF) approach has been established as a powerful theoretical technique for computing the transport properties of tunnel-coupled hybrid nanowire devices. Such nanowires may exhibit topologically nontrivial sup…
View article: Giant Shot Noise from Majorana Zero Modes in Topological Trijunctions
Giant Shot Noise from Majorana Zero Modes in Topological Trijunctions Open
The clear-cut experimental identification of Majorana bound states in transport measurements still poses experimental challenges. We here show that the zero-energy Majorana state formed at a junction of three topological superconductor wir…
View article: Finite frequency noise in a normal metal–topological superconductor junction
Finite frequency noise in a normal metal–topological superconductor junction Open
International audience
View article: Fermi-Liquid Approach for Superconducting Kondo Problems
Fermi-Liquid Approach for Superconducting Kondo Problems Open
We present a Fermi liquid approach to superconducting Kondo problems applicable when the Kondo temperature is large compared to the superconducting gap. To illustrate the theory, we study the current-phase relation and the Andreev level sp…
View article: Josephson effect in junctions of conventional and topological superconductors
Josephson effect in junctions of conventional and topological superconductors Open
We present a theoretical analysis of the equilibrium Josephson current-phase relation in hybrid devices made of conventional s -wave spin-singlet superconductors (S) and topological superconductor (TS) wires featuring Majorana end states. …
View article: Josephson effect in multiterminal topological junctions
Josephson effect in multiterminal topological junctions Open
We study the Josephson effect in a trijunction formed by two topological\nsuperconductor (TS) wires and a conventional $s$-wave superconductor. Using a\nboundary Green's function formalism, analytical results for the current-phase\nrelatio…
View article: Hanbury Brown and Twiss noise correlations in a topological superconductor beam splitter
Hanbury Brown and Twiss noise correlations in a topological superconductor beam splitter Open
We study Hanbury-Brown and Twiss current cross-correlations in a\nthree-terminal junction where a central topological superconductor (TS)\nnanowire, bearing Majorana bound states at its ends, is connected to two normal\nleads. Relying on a…
View article: Low-energy theory of transport in Majorana wire junctions
Low-energy theory of transport in Majorana wire junctions Open
We formulate and apply a low-energy transport theory for hybrid quantum\ndevices containing junctions of topological superconductor (TS) wires and\nconventional normal (N) or superconducting (S) leads. We model TS wires as\nspinless $p$-wa…
View article: Kondo physics from quasiparticle poisoning in Majorana devices
Kondo physics from quasiparticle poisoning in Majorana devices Open
We present a theoretical analysis of quasiparticle poisoning in\nCoulomb-blockaded Majorana fermion systems tunnel-coupled to normal-conducting\nleads. Taking into account finite-energy quasiparticles, we derive the\neffective low-energy t…