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Borregaard, J. (author), Christandl, Matthias (author), Stilck França, Daniel (author)
We describe a resource-efficient approach to studying many-body quantum states on noisy, intermediate-scale quantum devices. We employ a sequential generation model that allows us to bound the range of correlations in the resulting many-body quantum states. From this, we characterize situations where the estimation of local observables does...
journal article 2021
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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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Kringhøj, A. (author), Larsen, T. W. (author), Erlandsson, O. (author), Uilhoorn, W. (author), Kroll, J. (author), Hesselberg, M. (author), McNeil, R. P.G. (author), Krogstrup, P. (author), Casparis, L. (author), Marcus, C. M. (author)
We present a hybrid semiconductor-based superconducting qubit device that remains coherent at magnetic fields up to 1 T. The qubit transition frequency exhibits periodic oscillations with the magnetic field, consistent with interference effects due to the magnetic flux threading the cross section of the proximitized semiconductor nanowire...
journal article 2021
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Kloss, Thomas (author), Weston, J.B. (author), Gaury, Benoit (author), Rossignol, Benoit (author), Groth, Christoph (author), Waintal, Xavier (author)
Tkwant is a Python package for the simulation of quantum nanoelectronics devices to which external time-dependent perturbations are applied. Tkwant is an extension of the kwant package (https://kwant-project.org/) and can handle the same types of systems: discrete tight-binding-like models that consist of an arbitrary central region connected...
journal article 2021
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Ciani, A. (author), Terhal, B.M. (author)
We analyze whether circuit QED Hamiltonians are stoquastic, focusing on systems of coupled flux qubits. We show that scalable sign-problem-free path integral Monte Carlo simulations can typically be performed for such systems. Despite this, we corroborate the recent finding [I. Ozfidan, Phys. Rev. Appl. 13, 034037 (2020)10.1103/PhysRevApplied...
journal article 2021
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Hahn, W. (author), Dobrovitski, V.V. (author)
Long-lived coherences, emerging under periodic pulse driving in the disordered ensembles of strongly interacting spins, offer immense advantages for future quantum technologies, but the physical origin and the key properties of this phenomenon remain poorly understood. We theoretically investigate this effect in ensembles of different...
journal article 2021
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Sinclair, Neil (author), Oblak, Daniel (author), Saglamyurek, Erhan (author), Cone, Rufus L. (author), Thiel, Charles W. (author), Tittel, W. (author)
We characterize the optical coherence and energy-level properties of the 795-nm H63 to H43 transition of Tm3+ in a Ti4+:LiNbO3 waveguide at temperatures as low as 0.65 K. Coherence properties are measured with varied temperature, magnetic field, optical excitation power and wavelength, and measurement timescale. We also investigate nuclear...
journal article 2021
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Rymarz, Martin (author), Bosco, Stefano (author), Ciani, A. (author), Divincenzo, David P. (author)
We present a circuit design composed of two Josephson junctions coupled by a nonreciprocal element, the gyrator, whose ground space is doubly degenerate. The ground states are approximate code words of the Gottesman-Kitaev-Preskill code. We determine the low-energy dynamics of the circuit by working out the equivalence of this system to the...
journal article 2021
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De Almeida Nascimento e Melo, A.A. (author), Liu, C. (author), Rozek, P.M. (author), Rosdahl, T.O. (author), Wimmer, M.T. (author)
Tunneling conductance spectroscopy in normal metal-superconductor junctions is an important tool for probing Andreev bound states in mesoscopic superconducting devices, such as Majorana nanowires. In an ideal superconducting device, the subgap conductance obeys specific symmetry relations, due to particle-hole symmetry and unitarity of the...
journal article 2021
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op het Veld, R.L.M. (author), Xu, D. (author), Schaller, V. (author), Wang, Q. (author), de Moor, M.W.A. (author), Hesselmann, Bart (author), Vermeulen, K.J. (author), Bommer, J.D.S. (author), Kouwenhoven, Leo P. (author), Zhang, H. (author)
The Data availability statement of this article has been modified to add the accession link to the raw data. The old Data availability statement read “Materials and data that support the findings of this research are available within the paper. All data are available from the corresponding author upon request”. This has been replaced by ...
journal article 2021
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Ruf, M.T. (author), Weaver, M.J. (author), van Dam, S.B. (author), Hanson, R. (author)
The nitrogen-vacancy (N-V) center in diamond has been established as a prime building block for quantum networks. However, scaling beyond a few network nodes is currently limited by low spin-photon entanglement rates, resulting from the N-V center's low probability of coherent photon emission and collection. Integration into a cavity can...
journal article 2021
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Kashiwagi, Takanari (author), Yuasa, Takumi (author), Kuwano, Genki (author), Yamamoto, T. (author), Tsujimoto, Manabu (author), Minami, Hidetoshi (author), Kadowaki, Kazuo (author)
The radiation intensity from the intrinsic Josephson junction high-T<sub>c</sub> superconductor Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> terahertz emitters (Bi2212-THz emitters) is one of the most important characteristics for application uses of the device. In principle, it would be expected to be improved with increasing...
journal article 2021
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Yurttagul, N.F. (author), Sarsby, M. (author), Geresdi, A. (author)
The charge localization of single electrons on mesoscopic metallic islands leads to a suppression of the electrical current, known as the Coulomb blockade. When this correction is small, it enables primary electron thermometry, as it was first demonstrated by Pekola et al. (Phys Rev Lett 73:2903, 1994). However, in the low temperature limit,...
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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Jung, Kyunghoon (author), Abobeih, M.H.M.A. (author), Yun, Jiwon (author), Kim, Gyeonghun (author), Oh, Hyunseok (author), Henry, Ang (author), Taminiau, T.H. (author), Kim, Dohun (author)
The detection of nuclear spins using individual electron spins has enabled diverse opportunities in quantum sensing and quantum information processing. Proof-of-principle experiments have demonstrated atomic-scale imaging of nuclear-spin samples and controlled multi-qubit registers. However, to image more complex samples and to realize larger...
journal article 2021
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Korzekwa, Kamil (author), Lostaglio, M.G. (author)
We investigate the problem of simulating classical stochastic processes through quantum dynamics and present three scenarios where memory or time quantum advantages arise. First, by introducing and analyzing a quantum version of the embeddability problem for stochastic matrices, we show that quantum memoryless dynamics can simulate classical...
journal article 2021
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Pöyhönen, K.K. (author), Varjas, D. (author), Wimmer, M.T. (author), Akhmerov, A.R. (author)
Platforms for creating Majorana quasiparticles rely on superconductivity and breaking of time-reversal symmetry. By studying continuous deformations to known trivial states, we find that the relationship between superconducting pairing and time reversal breaking imposes rigorous bounds on the topology of the system. Applying these bounds to s...
journal article 2021
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van Diepen, C.J. (author), Hsiao, T. (author), Mukhopadhyay, U. (author), Reichl, Christian (author), Wegscheider, Werner (author), Vandersypen, L.M.K. (author)
The spin of a single electron in a semiconductor quantum dot provides a well-controlled and long-lived qubit implementation. The electron charge in turn allows control of the position of individual electrons in a quantum dot array, and enables charge sensors to probe the charge configuration. Here we show that the Coulomb repulsion allows an...
journal article 2021
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Aggarwal, Kushagra (author), Hofmann, Andrea (author), Jirovec, Daniel (author), Prieto, Ivan (author), Sammak, A. (author), Botifoll, Marc (author), Martí-Sánchez, Sara (author), Veldhorst, M. (author), Scappucci, G. (author)
Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid superconductor-semiconductor devices. A key challenge towards hybrid Ge-based quantum technologies is the design of high-quality...
journal article 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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