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- Title
Robust oscillator-mediated phase gates driven by low-intensity pulses.
- Authors
Arrazola, Iñigo; Casanova, Jorge
- Abstract
Robust qubit-qubit interactions mediated by bosonic modes are central to many quantum technologies. Existing proposals combining fast oscillator-mediated gates with dynamical decoupling require strong pulses or fast control over the qubit-boson coupling. Here, we present a method based on dynamical decoupling techniques that leads to faster-than-dispersive entanglement gates with low-intensity pulses. Our method is general, i.e., it is applicable to any quantum platform that has qubits interacting with bosonic mediators via longitudinal coupling. Moreover, the protocol provides robustness to fluctuations in qubit frequencies and control fields, while also being resistant to common errors such as frequency shifts and heating in the mediator as well as crosstalk effects. We illustrate our method with an implementation for trapped ions coupled via magnetic field gradients. With detailed numerical simulations, we show that entanglement gates with infidelities of 10−3 or 10−4 are possible with current or near-future experimental setups, respectively. The generation of entanglement in qubit-oscillator systems is often hindered by low-intensity driving fields, and limited control of qubit-oscillator coupling. The authors design a general method to achieve robust entanglement gates using low-intensity dynamical-decoupling pulses with non-tuneable qubit-oscillator coupling.
- Subjects
ION traps; MAGNETIC fields; QUBITS; COMPUTER simulation
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01243-8