Search Results - "Rohling, Niklas"

Quantum state tomography as a numerical optimization problem by Ivanova-Rohling, Violeta N, Burkard, Guido, Rohling, Niklas

“…We present a framework that formulates the quest for the most efficient quantum state tomography (QST) measurement set as an optimization problem which can be…”
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Evaluating Machine Learning Approaches for Discovering Optimal Sets of Projection Operators for Quantum State Tomography of Qubit Systems by Ivanova-Rohling, Violeta N., Rohling, Niklas

“…Finding optimal measurement schemes in quantum state tomography is a fundamental problem in quantum computation. It is known that for non-degenerate operators…”
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Optimization of electron pumping by harmonic mixing by Rohling, Niklas, Grossmann, Frank

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Universal quantum computing with spin and valley states by Rohling, Niklas, Burkard, Guido

“…We investigate a two-electron double quantum dot with both spin and valley degrees of freedom as they occur in graphene, carbon nanotubes or silicon and regard…”
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Hybrid spin and valley quantum computing with singlet-triplet qubits by Rohling, Niklas, Russ, Maximilian, Burkard, Guido

“…The valley degree of freedom in the electronic band structure of silicon, graphene, and other materials is often considered to be an obstacle for quantum…”
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Optimal quantum state tomography with noisy gates by Ivanova-Rohling, Violeta N., Rohling, Niklas, Burkard, Guido

“…Quantum state tomography (QST) represents an essential tool for the characterization, verification, and validation (QCVV) of quantum processors. Only for a few…”
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Tomography scheme for two spin- 1 2 qubits in a double quantum dot by Rohling, Niklas, Burkard, Guido

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Even-odd effect for spin current through thin antiferromagnetic insulator by Rohling, Niklas, Troncoso, Roberto E

“…Magnon spin transport in a metal-antiferromagnetic insulator-ferromagnetic insulator heterostructure is considered. The spin current is generated via the spin…”
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Influence of disorder at Insulator-Metal interface on spin transport by Heydari, Mahsa Seyed, Belzig, Wolfgang, Rohling, Niklas

“…Motivated by experimental work showing enhancement of spin transport between Yttrium Iron Garnet and Platinum by a thin antiferromagnetic insulator between…”
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Dipole-dipole-interaction-induced entanglement between two-dimensional ferromagnets by Wuhrer, Dennis, Rohling, Niklas, Belzig, Wolfgang

“…We investigate the viability of dipole-dipole interaction as a means of entangling two distant ferromagnets. To this end we make use of the Bogoliubov…”
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Tomography scheme for two spin-[1/2] qubits in a double quantum dot by Rohling, Niklas, Burkard, Guido

“…We present a scheme for full quantum state tomography tailored for two spin qubits in a double quantum dot. Aset of 15 quantum states allows to determine the…”
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Discovery of an exchange-only gate sequence for CNOT with record-low gate time using reinforcement learning by Ivanova-Rohling, Violeta N, Rohling, Niklas, Burkard, Guido

“…Exchange-only quantum computation is a version of spin-based quantum computation that entirely avoids the difficulty of controlling individual spins by a…”
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Theory of quantum entanglement and the structure of two-mode squeezed antiferromagnetic magnon vacuum by Wuhrer, Dennis, Rohling, Niklas, Belzig, Wolfgang

“…Phys. Rev. B 105, 054406 (2022) Recent investigations of the quantum properties of an antiferromagnet in the spin wave approximation have identified the…”
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Optimal Quantum State Tomography with Noisy Gates by Ivanova-Rohling, Violeta N, Rohling, Niklas, Burkard, Guido

“…Quantum state tomography (QST) represents an essential tool for the characterization, verification, and validation (QCVV) of quantum processors. Only for a few…”
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Quantum state tomography as a numerical optimization problem by Ivanova-Rohling, Violeta N, Burkard, Guido, Rohling, Niklas

“…New J. Phys. 23, 123034 (2021) We present a framework that formulates the quest for the most efficient quantum state tomography scheme as an optimization…”
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Superconductivity at metal-antiferromagnetic insulator interfaces by Fjærbu, Eirik Løhaugen, Rohling, Niklas, Brataas, Arne

“…Phys. Rev. B 100, 125432 (2019) Magnons in antiferromagnetic insulators couple strongly to conduction electrons in adjacent metals. We show that this…”
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Optimizing electrically controlled echo sequences for the exchange-only qubit by Rohling, Niklas, Burkard, Guido

“…Phys. Rev. B 93, 205434 (2016) Recently, West and Fong [New J. Phys. 14, 083002 (2012)] introduced an echo scheme for an exchange-only qubit, which relies…”
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Optimal choice of state tomography quorum formed by projection operators by Ivanova-Rohling, Violeta N, Rohling, Niklas

“…Phys. Rev. A 100, 032332 (2019) A minimal set of measurement operators for quantum state tomography has in the non-degenerate case ideally eigenbases which are…”
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Superconductivity Induced by Interfacial Coupling to Magnons by Rohling, Niklas, Fjærbu, Eirik Løhaugen, Brataas, Arne

“…Phys. Rev. B 97, 115401 (2018) We consider a thin normal metal sandwiched between two ferromagnetic insulators. At the interfaces, the exchange coupling causes…”
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Electrically Driven Bose-Einstein Condensation of Magnons in Antiferromagnets by Fjærbu, Eirik Løhaugen, Rohling, Niklas, Brataas, Arne

“…Phys. Rev. B 95, 144408 (2017) We explore routes to realize electrically driven Bose-Einstein condensation of magnons in insulating antiferromagnets. Even in…”
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