Macroscopic entanglement between two magnon modes via two-tone driving of a superconducting qubit
Rong-Can Yang, Gang Liu, Gen Li, Jie Li
TLDR
This paper proposes a method to achieve macroscopic entanglement between two magnon modes in YIG spheres using a two-tone driven superconducting qubit.
Key contributions
- Proposes entangling two magnon modes in separate YIG spheres via a superconducting qubit.
- Utilizes a two-tone driving field on the qubit to mediate the magnon entanglement.
- Shows strong entanglement is achievable with currently feasible experimental parameters.
- Provides a specific detection scheme for experimentally verifying the entanglement.
Why it matters
This work offers a pathway to realize macroscopic entanglement involving over 10^18 spins in millimeter-sized YIG spheres. Such a system is crucial for fundamental studies in macroscopic quantum mechanics and testing unconventional decoherence theories.
Original Abstract
The cavity-mediated coupling between magnons in an yttrium-iron-garnet (YIG) sphere and a superconducting qubit has recently been demonstrated as a new platform for preparing macroscopic quantum states. Here, based on this system, we propose to entangle two magnon modes in two YIG spheres by driving the qubit with a two-tone field and by appropriately choosing the frequencies and strengths of the two driving fields. We show that strong entanglement can be achieved with fully feasible parameters. We further provide a detection scheme for experimentally verifying the entanglement. Our results indicate that macroscopic entanglement between two magnon modes in two millimeter-sized YIG spheres, involving more than $10^{18}$ spins, can be realized using currently available parameters, which finds promising applications in fundamental studies, such as macroscopic quantum mechanics and the test of unconventional decoherence theories.
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