368 citations · 1.7k across the 26 of their papers we have counts for
17 papers · 1 filter
Hot Carrier Thermalization and Josephson Inductance Thermometry in a Graphene-based Microwave Circuit
Raj Katti, Harpreet Arora, Olli-Pentti Saira +5
Due to its exceptional electronic and thermal properties, graphene is a key material for bolometry, calorimetry, and photon detection. However, despite graphene's relatively simple…
Modification of electron-phonon coupling by micromachining and suspension
Olli-Pentti Saira, Matthew H. Matheny, Libin Wang +2
Weak electron-phonon interaction in metals at low temperatures forms the basis of operation for cryogenic hot-electron bolometers and calorimeters. Standard power laws, describing…
Nonequilibrium thermodynamics of erasure with superconducting flux logic
Olli-Pentti Saira, Matthew H. Matheny, Raj Katti +5
We implement a thermal-fluctuation driven logical bit reset on a superconducting flux logic cell. We show that the logical state of the system can be continuously monitored with on…
Crossover between electron-phonon and boundary resistance limited thermal relaxation in copper films
L. B. Wang, O. -P. Saira, D. S. Golubev +1
We observe a crossover from electron-phonon (ep) coupling limited energy relaxation to that governed by thermal boundary resistance (pp) in copper films at sub-kelvin temperatures.…
Fast thermometry with a proximity Josephson junction
Libin Wang, Olli-Pentti Saira, Jukka Pekola
We couple a proximity Josephson junction to a Joule-heated normal metal film and measure its electron temperature under steady state and nonequilibrium conditions. With a timed seq…
Thermal conductance of Nb thin films at sub-kelvin temperatures
A. V. Feshchenko, O. -P. Saira, J. T. Peltonen +1
We determine the thermal conductance of thin niobium (Nb) wires on a silica substrate in the temperature range of 0.1 - 0.6 K using electron thermometry based on normal metal-insul…
Tunnel-Junction Thermometry Down to Millikelvin Temperatures
A. V. Feshchenko, L. Casparis, I. M. Khaymovich +6
We present a simple on-chip electronic thermometer with the potential to operate down to 1 mK. It is based on transport through a single normal-metal - superconductor tunnel juncti…
Fast electron thermometry towards ultra-sensitive calorimetric detection
S. Gasparinetti, K. L. Viisanen, O. -P. Saira +4
We demonstrate radiofrequency thermometry on a micrometer-sized metallic island below 100 mK. Our device is based on a normal metal-insulator-superconductor tunnel junction coupled…
Entanglement genesis by ancilla-based parity measurement in 2D circuit QED
O. -P. Saira, J. P. Groen, J. Cramer +3
We present an indirect two-qubit parity meter in planar circuit quantum electrodynamics, realized by discrete interaction with an ancilla and a subsequent projective ancilla measur…
Single-electron current sources: towards a refined definition of ampere
J. P. Pekola, O. -P. Saira, V. F. Maisi +4
Controlling electrons at the level of elementary charge has been demonstrated experimentally already in the 1980's. Ever since, producing an electrical current , or its int…
Test of Jarzynski and Crooks fluctuation relations in an electronic system
O. -P. Saira, Y. Yoon, T. Tanttu +3
Recent progress on micro- and nanometer scale manipulation has opened the possibility to probe systems small enough that thermal fluctuations of energy and coordinate variables can…
Work, free energy and dissipation in voltage driven single-electron transitions
J. P. Pekola, O. -P. Saira
We apply the general procedure presented by Jarzynski in [1] to the problem of dissipation in a voltage-driven single-electron box. We obtain the expression of dissipated work, and…
Real-time observation of discrete Andreev tunneling events
V. F. Maisi, O. -P. Saira, Yu. A. Pashkin +3
We provide a direct proof of two-electron Andreev transitions in a superconductor - normal metal tunnel junction by detecting them in a real-time electron counting experiment. Our…
Environmentally Activated Tunneling Events in a Hybrid Single-Electron Box
O. -P. Saira, M. Mottonen, V. F. Maisi +1
We have measured individual tunneling events and Coulomb step shapes in single-electron boxes with opaque superconductor-normal metal tunnel junctions. We observe anomalous broaden…
Hybrid single-electron transistor as a source of quantized electric current
Jukka P. Pekola, Juha J. Vartiainen, Mikko Mottonen +3
The basis of synchronous manipulation of individual electrons in solid-state devices was laid by the rise of single-electronics about two decades ago. Ultra-small structures in a l…
Heat Transistor: Demonstration of Gate-Controlled Electron Refrigeration
Olli-Pentti Saira, Matthias Meschke, Francesco Giazotto +3
We present experiments on a superconductor-normal metal electron refrigerator in a regime where single-electron charging effects are significant. The system functions as a heat tra…
Radio-Frequency Single-Electron Refrigerator
Jukka P. Pekola, Francesco Giazotto, Olli-Pentti Saira
We propose a cyclic refrigeration principle based on mesoscopic electron transport. Synchronous sequential tunnelling of electrons in a Coulomb-blockaded device, a normal metal-sup…