2018
DOI: 10.1103/physreva.97.022330
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Analytical modeling of parametrically modulated transmon qubits

Abstract: Building a scalable quantum computer requires developing appropriate models to understand and verify its complex quantum dynamics. We focus on superconducting quantum processors based on transmons for which full numerical simulations are already challenging at the level of qubytes. It is thus highly desirable to develop accurate methods of modeling qubit networks that do not rely solely on numerical computations. Using systematic perturbation theory to large orders in the transmon regime, we derive precise ana… Show more

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Cited by 80 publications
(98 citation statements)
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“…Moreover, the quest for useful quantum computations before full quantum error correction becomes available may be assisted by efficient, short-depth gate sequences based on two-or multi-qubit gates [14,15] with versatile types of interactions. In particular, parametric schemes based on tunable couplers have been proposed and recently realized as a means to achieve fast gates with high fidelities [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”
mentioning
confidence: 99%
“…Moreover, the quest for useful quantum computations before full quantum error correction becomes available may be assisted by efficient, short-depth gate sequences based on two-or multi-qubit gates [14,15] with versatile types of interactions. In particular, parametric schemes based on tunable couplers have been proposed and recently realized as a means to achieve fast gates with high fidelities [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”
mentioning
confidence: 99%
“…The two-qubit gates available in the transmonlike superconducting qubit architecture can roughly be split into two broad families as outlined previously: one group requiring local magnetic fields to tune the transition frequency of qubits and one group consisting of all-microwave control. There exist several hybrid schemes that combine various aspects of these two categories and, in particular, the notions of tunable coupling and parametric driving are proving to be important ingredients in modern superconducting qubit processors 63,67,89,103,106,[207][208][209][210][211][212][213] . In this section, however, we start by introducing the iSWAP gate, and then review the CPHASE (controlled-phase) in Section IV F and the CR (cross-resonance) in Section IV G. We briefly review a few other two-qubit gates and discuss their merits in Sections IV G 4 and IV H.…”
Section: E the Iswap Two-qubit Gate In Tunable Qubitsmentioning
confidence: 99%
“…A hybrid approach, in which a combination of tunable and fixed-frequency qubits is used, was recently demonstrated for both iSWAP and CPHASE gates 67,105,211 . This scheme has no added tunable qubits (or resonators) acting as the coupling element, but rather, relies solely on an always-on capacitive coupling between the qubits, and the effective coupling is roughly half that of the always-on coupling.…”
Section: H Gate Implementations With Tunable Couplingmentioning
confidence: 99%
“…Our chosen entangling gate is a parametrically activated controlled-Z (CZ) gate, which has the unitary representation U = diag(1, 1, 1, −1). This gate is native to our architecture, as shown by the first harmonic terms of the Hamiltonian of a capacitively coupled fixed and tunable transmon under flux modulation in the interaction picture [27] H int = g 20 e i(2ωp−[∆+η F ])t e iβ20 |11 20| (4)…”
Section: Cross Tomographymentioning
confidence: 99%
“…In order to operate high-fidelity gates simultaneously, we would like to know whether there are certain operating points that are more resilient to crosstalk. In previous work, the concept of an "AC sweet spot" for parametrically activated entangling gates has been discussed [27]. This AC sweet spot is located at the point of maximal detuning of the tunable qubit from its parking frequency.…”
Section: Cross Tomographymentioning
confidence: 99%