Searched for: author%3A%22Sagastizabal%2C+R.E.%22
(1 - 9 of 9)
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Sagastizabal, R.E. (author)
Superconducting qubits have seen a tremendous progress in the last two decades, and yet they remain unable to extract quantum advantage for application scenarios. While algorithms like Shor’s demonstrate quantum advantage in theory, they do not seem to fit modern noisy quantum processors. Then, in order to achieve quantum advantage either modern...
doctoral thesis 2023
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Negîrneac, V. (author), Ali, H.A.S. (author), Muthusubramanian, N. (author), Battistel, F. (author), Sagastizabal, R.E. (author), Moreira, M. S. (author), Ferreira Marques, J.M. (author), Vlothuizen, W.J. (author), Beekman, M.C. (author), Zachariadis, C. (author), Haider, S.N. (author), Bruno, A. (author), DiCarlo, L. (author)
Simple tuneup of fast two-qubit gates is essential for the scaling of quantum processors. We introduce the sudden variant (SNZ) of the net zero scheme realizing controlled-Z (CZ) gates by flux control of transmon frequency. SNZ CZ gates realized in a multitransmon processor operate at the speed limit of transverse coupling between...
journal article 2021
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Sagastizabal, R.E. (author), Klaver, B. A. (author), Rol, M.A. (author), Negîrneac, V. (author), Zou, X. (author), Muthusubramanian, N. (author), Beekman, M. (author), Zachariadis, C. (author), Ostroukh, V.P. (author), Haider, S.N. (author), Bruno, A. (author), DiCarlo, L. (author)
The preparation of thermal equilibrium states is important for the simulation of condensed matter and cosmology systems using a quantum computer. We present a method to prepare such mixed states with unitary operators and demonstrate this technique experimentally using a gate-based quantum processor. Our method targets the generation of...
journal article 2021
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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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O'Brien, T.E. (author), Sejean, Bruno (author), Sagastizabal, R.E. (author), Bonet Monroig, X. (author), Dutkiewicz, Alicja (author), Buda, F (author)
Modeling chemical reactions and complicated molecular systems has been proposed as the“killer application”of a future quantumcomputer. Accurate calculations of derivatives of molecular eigenenergies are essential toward this end, allowing for geometryoptimization, transition state searches, predictions of the response to an applied electric or...
journal article 2019
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Sagastizabal, R.E. (author), Bonet Monroig, X. (author), Singh, Malay (author), Rol, M.A. (author), Bultink, C.C. (author), Fu, X. (author), Ostroukh, V.P. (author), Muthusubramanian, N. (author), Bruno, A. (author), Beekman, M.C. (author), Haider, S.N. (author), O'Brien, T.E. (author), DiCarlo, L. (author)
Variational quantum eigensolvers offer a small-scale testbed to demonstrate the performance of error mitigation techniques with low experimental overhead. We present successful error mitigation by applying the recently proposed symmetry verification technique to the experimental estimation of the ground-state energy and ground state of the...
journal article 2019
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Dickel, C. (author), Wesdorp, J.J. (author), Langford, N.K. (author), Peiter, S.R. (author), Sagastizabal, R.E. (author), Bruno, A. (author), Criger, D.B. (author), Motzoi, F. (author), DiCarlo, L. (author)
While the on-chip processing power in circuit QED devices is growing rapidly, an open challenge is to establish high-fidelity quantum links between qubits on different chips. Here, we show entanglement between transmon qubits on different cQED chips with 49% concurrence and 73% Bell-state fidelity. We engineer a half-parity measurement by...
journal article 2018
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Bonet Monroig, X. (author), Sagastizabal, R.E. (author), Singh, M (author), O'Brien, T.E. (author)
We investigate the performance of error mitigation via measurement of conserved symmetries on near-term devices. We present two protocols to measure conserved symmetries during the bulk of an experiment, and develop a third, zero-cost, post-processing protocol which is equivalent to a variant of the quantum subspace expansion. We develop...
journal article 2018
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Langford, N.K. (author), Sagastizabal, R.E. (author), Kounalakis, M. (author), Dickel, C. (author), Bruno, A. (author), Lüthi, F. (author), Thoen, David (author), Endo, A. (author), DiCarlo, L. (author)
The quantum Rabi model describing the fundamental interaction between light and matter is a cornerstone of quantum physics. It predicts exotic phenomena like quantum phase transitions and ground-state entanglement in ultrastrong and deep-strong coupling regimes, where coupling strengths are comparable to or larger than subsystem energies....
journal article 2017
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