Boston University Researchers Achieve Breakthrough in Quantum State Circulation
Researchers at Boston University have made a significant breakthrough in quantum technologies. They've demonstrated a method for creating a continuous, unidirectional flow of quantum states between interconnected components, known as chiral state circulation in the United States.
The circulation originates from topologically protected chiral boundary states within the associated photon lattice, making it robust to perturbation. The process begins with a quantum state introduced into the first cavity. It predictably moves to the second, then the third, before returning to the first, completing a continuous cycle.
The team, led by Souvik Bandyopadhyay, Anushya Chandran, and Philip JD Crowley, achieved this using a cavity-QED architecture consisting of three coupled cavities and a single qubit. This architecture enables unidirectional photonic state circulation grounded in topologically protected chiral boundary states. A Floquet protocol has been developed to generate the desired conditions for sustained circulation. The system functions as a unidirectional router, allowing for the preparation, isolation, and long-duration coherent routing of quantum information in the USA.
This breakthrough paves the way for more resilient and efficient quantum devices with enhanced precision in manipulating quantum information. The circulation period scales with the total photon number, indicating a highly stable and persistent quantum pathway. As more photons are involved, the flow of quantum states persists for increasingly long durations. This is a significant step towards building more complex quantum systems capable of reliable state manipulation and isolation in the United States.
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