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Dahlberg, E.A. (author), van der Vecht, B. (author), Delle Donne, C. (author), Skrzypczyk, M.D. (author), te Raa, I. (author), Kozlowski, W. (author), Wehner, S.D.C. (author)We introduce NetQASM, a low-level instruction set architecture for quantum internet applications. NetQASM is a universal, platform-independent and extendable instruction set with support for local quantum gates, powerful classical logic and quantum networking operations for remote entanglement generation. Furthermore, NetQASM allows for close...journal article 2022
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Frank, György (author), Varjas, D. (author), Vrana, Péter (author), Pintér, Gergo (author), Pályi, András (author)Quantum systems are often described by parameter-dependent Hamiltonians. Points in parameter space where two levels are degenerate can carry a topological charge. Here we theoretically study an interacting two-spin system where the degeneracy points form a nodal loop or a nodal surface in the magnetic parameter space, similarly to such...journal article 2022
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Dahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)A graph H is a vertex-minor of a graph G if it can be reached from G by the successive application of local complementations and vertex deletions. Vertex-minors have been the subject of intense study in graph theory over the last decades and have found applications in other fields such as quantum information theory. Therefore it is natural to...journal article 2022
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Rabbie, J. (author), Chakraborty, K. (author), Avis, G. (author), Wehner, S.D.C. (author)We consider the problem of deploying a quantum network on an existing fiber infrastructure, where quantum repeaters and end nodes can only be housed at specific locations. We propose a method based on integer linear programming (ILP) to place the minimal number of repeaters on such an existing network topology, such that requirements on end...journal article 2022
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Liu, Y. Y. (author), Philips, S.G.J. (author), Orona, L. A. (author), Samkharadze, Nodar (author), McJunkin, T. (author), Macquarrie, E. R. (author), Eriksson, M. A. (author), Vandersypen, L.M.K. (author), Yacoby, A. (author)Radio-frequency (rf) reflectometry offers a fast and sensitive method for charge sensing and spin readout in gated quantum dots. We focus in this work on the implementation of rf readout in accumulation-mode gate-defined quantum dots, where the large parasitic capacitance poses a challenge. We describe and test two methods for mitigating the...journal article 2021
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Ruf, M.T. (author), Wan, Noel H. (author), Choi, Hyeongrak (author), Englund, Dirk (author), Hanson, R. (author)With the ability to transfer and process quantum information, large-scale quantum networks will enable a suite of fundamentally new applications, from quantum communications to distributed sensing, metrology, and computing. This Perspective reviews requirements for quantum network nodes and color centers in diamond as suitable node candidates...review 2021
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Spring, H. (author), Akhmerov, A.R. (author), Varjas, D. (author)Protection of topological surface states by reflection symmetry breaks down when the boundary of the sample is misaligned with one of the high symmetry planes of the crystal. We demonstrate that this limitation is removed in amorphous topological materials, where the Hamiltonian is invariant on average under reflection over any axis due to...journal article 2021
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Lostaglio, M.G. (author), Ciani, A. (author)A standard approach to quantum computing is based on the idea of promoting a classically simulable and fault-tolerant set of operations to a universal set by the addition of "magic"quantum states. In this context, we develop a general framework to discuss the value of the available, nonideal magic resources, relative to those ideally required...journal article 2021
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Liles, S. D. (author), Martins, F. (author), Miserev, D. S. (author), Kiselev, A. (author), Thorvaldson, I. D. (author), Rendell, M. J. (author), Jin, I. K. (author), Hudson, F. E. (author), Veldhorst, M. (author)Single holes confined in semiconductor quantum dots are a promising platform for spin-qubit technology, due to the electrical tunability of the g factor of holes. However, the underlying mechanisms that enable electric spin control remain unclear due to the complexity of hole-spin states. Here, we study the underlying hole-spin physics of the...journal article 2021
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Heinrich, Andreas J. (author), Oliver, William D. (author), Vandersypen, L.M.K. (author), Ardavan, Arzhang (author), Sessoli, Roberta (author), Loss, Daniel (author), Jayich, Ania Bleszynski (author), Fernandez-Rossier, Joaquin (author), Laucht, Arne (author), Morello, Andrea (author)For the past three decades nanoscience has widely affected many areas in physics, chemistry and engineering, and has led to numerous fundamental discoveries, as well as applications and products. Concurrently, quantum science and technology has developed into a cross-disciplinary research endeavour connecting these same areas and holds...review 2021
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Möhle, C.M. (author), Ke, C. (author), Wang, Q. (author), Xiao, Di (author), Karwal, S. (author), Lodari, M. (author), Van De Kerkhof, Vincent (author), Termaat, Ruben (author), Scappucci, G. (author), Goswami, S. (author)Topological superconductivity can be engineered in semiconductors with strong spin-orbit interaction coupled to a superconductor. Experimental advances in this field have often been triggered by the development of new hybrid material systems. Among these, two-dimensional electron gases (2DEGs) are of particular interest due to their inherent...journal article 2021
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Vardoyan, G.S. (author), Skrzypczyk, M.D. (author), Wehner, S.D.C. (author)Distributed quantum applications impose requirements on the quality of the quantum states that they consume. When analyzing architecture implementations of quantum hardware, characterizing this quality forms an important factor in understanding their performance. Fundamental characteristics of quantum hardware lead to inherent tradeoffs...journal article 2021
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Davidson, J.H. (author), Woodburn, Philip J.T. (author), Marsh, Aaron D. (author), Olson, Kyle J. (author), Olivera, Adam (author), Das, A. (author), Falamarzi Askarani, M. (author), Tittel, W. (author), Cone, Rufus L. (author), Thiel, Charles W. (author)We characterize the magnetic properties for thulium ion energy levels in the (Tm:YGG) lattice with the goal to improve decoherence and reduce linewidth broadening caused by local host spins and crystal imperfections. More precisely, we measure hyperfine tensors for the lowest level of and excited states using a combination of spectral hole...journal article 2021
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Falamarzi Askarani, M. (author), Das, A. (author), Davidson, J.H. (author), Castro do Amaral, G. (author), Slater, J.A. (author), Marzban, S. (author), Cone, Rufus L. (author), Oblak, Daniel (author), Tittel, W. (author)We argue that long optical storage times are required to establish entanglement at high rates over large distances using memory-based quantum repeaters. Triggered by this conclusion, we investigate the 795.325 nm3 H6↔H34 transition of Tm:Y3Ga5O12 (Tm:YGG). Most importantly, we find that the optical coherence time can reach 1.1 ms, and, using...journal article 2021
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How to transform graph states using single-qubit operations: Computational complexity and algorithmsDahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)Graph states are ubiquitous in quantum information with diverse applications ranging from quantum network protocols to measurement based quantum computing. Here we consider the question whether one graph (source) state can be transformed into another graph (target) state, using a specific set of quantum operations (LC + LPM + CC): single...journal article 2020
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Rol, M.A. (author), Ciorciaro, L.S.L. (author), Malinowski, F.K. (author), Tarasinski, B.M. (author), Sagastizabal, R.E. (author), Bultink, C.C. (author), Salathe, Y. (author), Haandbaek, N. (author), Sedivy, J. (author), DiCarlo, L. (author)We introduce Cryoscope, a method for sampling on-chip baseband pulses used to dynamically control qubit frequency in a quantum processor. We specifically use Cryoscope to measure the step response of the dedicated flux control lines of two-junction transmon qubits in circuit QED processors with the temporal resolution of the room-temperature...journal article 2020
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Last, T. (author), Samkharadze, Nodar (author), Eendebak, P.T. (author), Versluis, R. (author), Xue, X. (author), Sammak, A. (author), Brousse, D. (author), Loh, K.K.L. (author), Polinder, H. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Maturova, K. (author), Veltin, J. (author), Alberts, G.J.N. (author)The mission of QuTech is to bring quantum technology to industry and society by translating fundamental scientific research into applied research. To this end we are developing Quantum Inspire (QI), a full-stack quantum computer prototype for future co-development and collaborative R&D in quantum computing. A prerelease of this prototype...conference paper 2020
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Dehollain Lorenzana, J.P. (author), Mukhopadhyay, U. (author), Michal, V.P. (author), Wang, Y. (author), Wunsch, B. (author), Reichl, C. (author), Wegscheider, W. (author), Rudner, M. S. (author), Demler, E. (author), Vandersypen, L.M.K. (author)Engineered, highly controllable quantum systems are promising simulators of emergent physics beyond the simulation capabilities of classical computers<sup>1</sup>. An important problem in many-body physics is itinerant magnetism, which originates purely from long-range interactions of free electrons and whose existence in real systems has...journal article 2020
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Dahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)Graph states, which include Bell states, Greenberger-Horne-Zeilinger (GHZ) states, and cluster states, form a well-known class of quantum states with applications ranging from quantum networks to error-correction. Whether two graph states are equivalent up to single-qubit Clifford operations is known to be decidable in polynomial time and has...journal article 2020
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Kharkov, Y. A. (author), Sotskov, V. E. (author), Karazeev, A. (author), Kiktenko, E. O. (author), Fedorov, A (author)Understanding properties of quantum matter is an outstanding challenge in science. In this paper, we demonstrate how machine-learning methods can be successfully applied for the classification of various regimes in single-particle and many-body systems. We realize neural network algorithms that perform a classification between regular and...journal article 2020