Good news! Amazing stuff! This could be a breakthrough!
"... Until this experiment, however, molecules had long defied controllable quantum entanglement. But ... found a way, through careful manipulation in the laboratory, to control individual molecules and coax them into these interlocking quantum states.
They also believed that molecules have certain advantages—over atoms, for example—that made them especially well-suited for certain applications in quantum information processing and quantum simulation of complex materials. Compared to atoms, for example, molecules have more quantum degrees of freedom and can interact in new ways. ...
In a separate article published in the same issue of Science, an independent research group ... achieved similar results.
"The fact that they got the same results verifies the reliability of our results," ... "They also show that molecular tweezer arrays are becoming an exciting new platform for quantum science." ..."
From the perspective abstract:
"The application of quantum science to information processing requires the controlled generation and manipulation of quantum entanglement (1), a state in which multiple particles cannot be expressed as a simple combination of the individual states of each particle. This situation reflects an inherent interparticle connection that transcends classical notions of particle separability. Although entanglement has been achieved in various atomic (2), photonic (3), and superconducting (4) platforms, the controlled creation of entanglement with molecules has been a long-standing challenge. On pages 1138 and 1143 of this issue ... respectively, report a method for tailoring the quantum states of individually addressable molecules to achieve quantum entanglement on demand. This strategy presents a promising new platform for the realization of different quantum technologies, such as computation and sensing, among other applications."
From the editor's summary and abstract (1):
"Editor’s summary
Ultracold atoms have long been candidates to be the building blocks of quantum information. Even more appealing are cold molecules, which have a richer energy-level structure and offer possibilities that atoms do not. However, achieving entanglement, one of the essential ingredients of a quantum information platform, has been difficult in a molecular system. Now, two groups ... have reached this goal using the dipolar interactions between calcium fluoride molecules placed in optical tweezers ...
Abstract
Ultracold polar molecules are promising candidate qubits for quantum computing and quantum simulations. Their long-lived molecular rotational states form robust qubits, and the long-range dipolar interaction between molecules provides quantum entanglement. In this work, we demonstrate dipolar spin-exchange interactions between single calcium monofluoride (CaF) molecules trapped in an optical tweezer array. We realized the spin-quantum XY model by encoding an effective spin-system into the rotational states of the molecules and used it to generate a Bell state through an iSWAP operation. Conditioned on the verified existence of molecules in both tweezers at the end of the measurement, we obtained a Bell state fidelity of 0.89(6). Using interleaved tweezer arrays, we demonstrate single-site molecular addressability."
From the abstract (2):
"Entanglement is crucial to many quantum applications, including quantum information processing, quantum simulation, and quantum-enhanced sensing. Because of their rich internal structure and interactions, molecules have been proposed as a promising platform for quantum science. Deterministic entanglement of individually controlled molecules has nevertheless been a long-standing experimental challenge. We demonstrate on-demand entanglement of individually prepared molecules. Using the electric dipolar interaction between pairs of molecules prepared by using a reconfigurable optical tweezer array, we deterministically created Bell pairs of molecules. Our results demonstrate the key building blocks needed for quantum applications and may advance quantum-enhanced fundamental physics tests that use trapped molecules."
Physicists ‘entangle’ individual molecules for the first time, bringing about a new platform for quantum science (Princeton University, primary source)
Perspective: Entanglement with tweezed molecules (no public access) Controlled molecular connection will advance quantum technologies
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| Laser setup for cooling, controlling, and entangling individual molecules. |
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