Photon-mediated long range coupling of two Andreev level qubits
- URL: http://arxiv.org/abs/2310.15995v1
- Date: Tue, 24 Oct 2023 16:40:49 GMT
- Title: Photon-mediated long range coupling of two Andreev level qubits
- Authors: L. Y. Cheung, R. Haller, A. Kononov, C. Ciaccia, J. H. Ungerer, T.
Kanne, J. Nyg\r{a}rd, P. Winkel, T. Reisinger, I. M. Pop, A. Baumgartner, C.
Sch\"onenberger
- Abstract summary: We show a coherent coupling between two Andreev levels qubits (ALQs) mediated by a microwave photon in a novel superconducting microwave cavity coupler.
We identify highly entangled two-qubit states for which the entanglement is mediated over a distance of six millimeters.
This work establishes ALQs as compact and scalable solid-state qubits.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In a superconducting weak link, the supercurrent is carried by Andreev bound
states (ABSs) formed by the phase-coherent reflection of electrons and their
time-reversed partners. A single, highly transmissive ABS can serve as an
ideal, compact two-level system, due to a potentially large energy difference
to the next ABS. While the coherent manipulation of such Andreev levels qubits
(ALQs) has been demonstrated, a long-range coupling between two ALQs, necessary
for advanced qubit architectures, has not been achieved, yet. Here, we
demonstrate a coherent remote coupling between two ALQs, mediated by a
microwave photon in a novel superconducting microwave cavity coupler. The
latter hosts two modes with different coupling rates to an external port. This
allows us to perform fast readout of each qubit using the strongly coupled
mode, while the weakly coupled mode is utilized to mediate the coupling between
the qubits. When both qubits are tuned into resonance with the latter mode, we
find excitation spectra with avoided-crossings, in very good agreement with the
Tavis-Cummings model. Based on this model, we identify highly entangled
two-qubit states for which the entanglement is mediated over a distance of six
millimeters. This work establishes ALQs as compact and scalable solid-state
qubits.
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