TY - JOUR AU - De, Jong D. AU - Prosko, C.G. AU - Han, L. AU - Malinowski, F.K. AU - Liu, Y. AU - Kouwenhoven, L.P. AU - Pfaff, W. TI - Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 131 PY - 2023 IS - 15 SN - 0031-9007 DO - 10.1103/PhysRevLett.131.157001 UR - https://m2.mtmt.hu/api/publication/34471666 ID - 34471666 N1 - QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, 2600 GA, Netherlands Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark Department of Physics, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States Export Date: 16 February 2024 CODEN: PRLTA Correspondence Address: Prosko, C.G.; QuTech and Kavli Institute of Nanoscience, Netherlands; email: cprosko@ualberta.net LA - English DB - MTMT ER - TY - JOUR AU - Bordoloi, Arunav AU - Zannier, Valentina AU - Sorba, Lucia AU - Schoenenberger, Christian AU - Baumgartner, Andreas TI - Spin cross-correlation experiments in an electron entangler JF - NATURE J2 - NATURE VL - 612 PY - 2022 SP - 454 EP - 458 PG - 5 SN - 0028-0836 DO - 10.1038/s41586-022-05436-z UR - https://m2.mtmt.hu/api/publication/33328272 ID - 33328272 AB - Correlations are fundamental in describing many-body systems. However, in experiments, correlations are notoriously difficult to assess on a microscopic scale, especially for electron spins. Even though it is firmly established theoretically that the electrons in a Cooper pair(1) of a superconductor form maximally spin-entangled singlet states with opposite spin projections(2-4), no spin correlation experiments have been demonstrated so far. Here we report the direct measurement ofthe spin cross-correlations between the currents of a Cooper pair splitter(5-13), an electronic device that emits electrons originating from Cooper pairs. We use ferromagnetic split-gates(14-15), compatible with nearby superconducting structures, to individually spin polarize the transmissions ofthe quantum dots in the two electronic paths, which act astunable spin filters. The signals are detected in standard transport and in highly sensitive transconductance experiments. We find that the spin cross-correlation is negative, consistent with spin singlet emission, and deviates from the ideal value mostly due to the overlap ofthe Zeeman split quantum dot states. Our results demonstrate a new route to perform spin correlation experiments in nano-electronic devices, especially suitable for those relying on magnetic field sensitive superconducting elements, like triplet ortopologically non-trivial superconductors(16-)(18), orto perform Bell tests with massive particles(19-20). LA - English DB - MTMT ER - TY - JOUR AU - Scherübl, Zoltán AU - Fülöp, Gergő AU - Gramich, Jörg AU - Pályi, András AU - Schönenberger, Christian AU - Nygard, Jesper AU - Csonka, Szabolcs TI - From Cooper pair splitting to nonlocal spectroscopy of a Shiba state JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 4 PY - 2022 IS - 2 PG - 11 SN - 2643-1564 DO - 10.1103/PhysRevResearch.4.023143 UR - https://m2.mtmt.hu/api/publication/32916679 ID - 32916679 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology; National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary; Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]; NKFIH fund TKP2020 IES; OTKA [132146, K138433]; QuantERA SuperTop [127900]; AndQC FetOpen project; SuperGate FetOpen project; Nanocohybri COST Action [CA16218]; Danish National Research Foundation; Swiss National Science Foundation [192027]; NCCR QSIT; NCCR SPIN; QuantERA project SuperTop; European Union [828948]; New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund [UNKP-21-5] Funding text: We acknowledge Morten H. Madsen for MBE growth, Titusz Feher, Peter Makk, C.at.alin Pascu Moca, Pascal Simon, Attila Virosztek, and Gergely Zarand for useful discussions. We also acknowledge SNI NanoImaging Lab for FIB cutting, and M. G. Beckerne, F. Fulop, and M. Hajdu for their technical support. This research was supported by the Ministry of Innovation and Technology and the National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary and by the Quantum Technology National Excellence Program (Project Nr. 2017-1.2.1-NKP-2017-00001), by the NKFIH fund TKP2020 IES (Grant No. BME-IE-NAT), and by the OTKA Grant No. 132146 and K138433, by QuantERA SuperTop project 127900, by AndQC FetOpen project, by SuperGate FetOpen project, by Nanocohybri COST Action CA16218, and by the Danish National Research Foundation. C.S. acknowledges support from the Swiss National Science Foundation through Grants No. 192027, the NCCR QSIT, NCCR SPIN, and the QuantERA project SuperTop. C.S. further acknowledges support from the European Union's Horizon 2020 research and innovation programme through Grant Agreement No. 828948, Project AndQC. G.F. acknowledges Bolyai Janos Scholarship and was supported by the UNKP-21-5 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund. AB - Cooper pair splitting (CPS) is a way to create spatially separated, entangled electron pairs. To this day, CPS is often identified in experiments as a spatial current correlation. However, such correlations can arise even in the absence of CPS, when a quantum dot is strongly coupled to the superconductor, and a subgap Shiba state is formed. Here, we present a detailed experimental characterization of those spatial current correlations, as the tunnel barrier strength between the quantum dot and the neighboring normal electrode is tuned. The correlation of the nonlocal signal and the barrier strength reveals a competition between CPS and the nonlocal probing of the Shiba state. We describe our experiment with a simple transport model and obtain the tunnel couplings of our device by fitting the model's prediction to the measured conductance correlation curve. Furthermore, we use our theory to extract the contribution of CPS to the nonlocal signal. LA - English DB - MTMT ER - TY - JOUR AU - Mantovani, Mattia AU - Belzig, Wolfgang AU - Rastelli, Gianluca AU - Hussein, Robert TI - Single-photon pump by Cooper-pair splitting JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 1 PY - 2019 IS - 3 PG - 9 SN - 2643-1564 DO - 10.1103/PhysRevResearch.1.033098 UR - https://m2.mtmt.hu/api/publication/31854717 ID - 31854717 AB - Hybrid quantum dot-oscillator systems have become attractive platforms to inspect quantum coherence effects at the nanoscale. Here, we investigate a Cooper-pair splitter setup consisting of two quantum dots, each linearly coupled to a local resonator. The latter can be realized either by a microwave cavity or a nanomechanical resonator. Focusing on the subgap regime, we demonstrate that cross-Andreev reflection, through which Cooper pairs are split into both dots, can induce nonlocal correlations between the two resonators. Harnessing these correlations allows to establish and control a nonlocal photon transfer between them. The proposed scheme can act as a photonic valve with single-photon accuracy, with potential applications for quantum heat engines and refrigerators involving mesoscopic resonators. LA - English DB - MTMT ER - TY - JOUR AU - Walldorf, Nicklas AU - Padurariu, Ciprian AU - Jauho, Antti-Pekka AU - Flindt, Christian TI - Electron Waiting Times of a Cooper Pair Splitter JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 120 PY - 2018 IS - 8 PG - 7 SN - 0031-9007 DO - 10.1103/PhysRevLett.120.087701 UR - https://m2.mtmt.hu/api/publication/27353777 ID - 27353777 LA - English DB - MTMT ER - TY - JOUR AU - Bubanja, Vladimir AU - Yamamoto, Mayumi AU - Iwabuchi, Shuichi TI - Nonequilibrium electron transport in a hybrid superconductor-normal metal entangler in a dissipative environment JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 94 PY - 2016 IS - 18 PG - 10 SN - 2469-9950 DO - 10.1103/PhysRevB.94.184515 UR - https://m2.mtmt.hu/api/publication/26276037 ID - 26276037 LA - English DB - MTMT ER - TY - JOUR AU - Duvauchelle, J E AU - Pfeffer, A H AU - Courtois, H AU - Lefloch, F TI - Quantum Coherence of the Quartet Scheme Observed by Shapiro Resonance Under Radio-Frequency Irradiation in Three Terminal Josephson Junctions JF - IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY J2 - IEEE T APPL SUPERCON VL - 26 PY - 2016 IS - 3 PG - 4 SN - 1051-8223 DO - 10.1109/TASC.2016.2515854 UR - https://m2.mtmt.hu/api/publication/26029390 ID - 26029390 LA - English DB - MTMT ER - TY - JOUR AU - Gecer, S AU - Ertekin, E AU - Yanmaz, E AU - Kósa, János Árpád AU - Safran, S AU - Özgüzel, R AU - Kilicarslan, E S AU - Kilic, A AU - Gencer, A TI - Switching and Decoupling Effects in a Single-Phase Transformer Using Extra DC Current JF - IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY J2 - IEEE T APPL SUPERCON VL - 26 PY - 2016 IS - 3 SN - 1051-8223 DO - 10.1109/TASC.2016.2537047 UR - https://m2.mtmt.hu/api/publication/3313254 ID - 3313254 N1 - Kósa János, Center of Excellence for Superconductivity Research, Ankara University, Golbasi, Turkey LA - English DB - MTMT ER - TY - JOUR AU - Hussein, Robert AU - Jaurigue, Lina AU - Governale, Michele AU - Braggio, Alessandro TI - Double quantum dot Cooper-pair splitter at finite couplings JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 94 PY - 2016 IS - 23 PG - 13 SN - 2469-9950 DO - 10.1103/PhysRevB.94.235134 UR - https://m2.mtmt.hu/api/publication/26402320 ID - 26402320 LA - English DB - MTMT ER - TY - JOUR AU - Bennett, A F TI - Spin-Statistics Connection for Relativistic Quantum Mechanics JF - FOUNDATIONS OF PHYSICS J2 - FOUND PHYS VL - 45 PY - 2015 IS - 4 SP - 370 EP - 381 PG - 12 SN - 0015-9018 DO - 10.1007/s10701-015-9869-6 UR - https://m2.mtmt.hu/api/publication/24855674 ID - 24855674 AB - The spin-statistics connection has been proved for nonrelativistic quantum mechanics (Jabs in Found Phys 40:776-792, 2010). The proof is extended here to the relativistic regime using the parametrized Dirac equation. A causality condition is not required. LA - English DB - MTMT ER - TY - JOUR AU - Fülöp, Gergő AU - Domínguez, F AU - d’Hollosy, S AU - Baumgartner, A AU - Makk, Péter AU - Madsen, M H AU - Guzenko, V A AU - Nygård, J AU - Schönenberger, C AU - Levy, Yeyati A AU - Csonka, Szabolcs TI - Magnetic Field Tuning and Quantum Interference in a Cooper Pair Splitter JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 115 PY - 2015 IS - 22 PG - 5 SN - 0031-9007 DO - 10.1103/PhysRevLett.115.227003 UR - https://m2.mtmt.hu/api/publication/2981975 ID - 2981975 LA - English DB - MTMT ER - TY - JOUR AU - Nigg, Simon E AU - Tiwari, Rakesh P AU - Walter, Stefan AU - Schmidt, Thomas L TI - Detecting nonlocal Cooper pair entanglement by optical Bell inequality violation JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 91 PY - 2015 IS - 9 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.91.094516 UR - https://m2.mtmt.hu/api/publication/24896137 ID - 24896137 LA - English DB - MTMT ER - TY - JOUR AU - Trocha, Piotr AU - Weymann, Ireneusz TI - Spin-resolved Andreev transport through double-quantum-dot Cooper pair splitters JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 91 PY - 2015 IS - 23 PG - 16 SN - 2469-9950 DO - 10.1103/PhysRevB.91.235424 UR - https://m2.mtmt.hu/api/publication/24898831 ID - 24898831 LA - English DB - MTMT ER - TY - JOUR AU - Fülöp, Gergő AU - d'Hollosy, S AU - Baumgartner, A AU - Makk, Péter AU - Guzenko, V A AU - Madsen, M H AU - Nygård, J AU - Schönenberger, C AU - Csonka, Szabolcs TI - Local electrical tuning of the nonlocal signals in a Cooper pair splitter JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 90 PY - 2014 IS - 23 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.90.235412 UR - https://m2.mtmt.hu/api/publication/2795734 ID - 2795734 LA - English DB - MTMT ER -