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Cavity quantum electrodynamics, which explores the granularity of light by coupling a resonator to a nonlinear emitter [1], has played a foundational role in the development of modern quantum information science and technology. In parallel, the field of condensed matter physics has been revolutionized by the discovery of underlying topological robustness in the face of disorder [2-4], often arising from the breaking of time-reversal symmetry, as in the case of the quantum Hall effect. In this work, we explore for the first time cavity quantum electrodynamics of a transmon qubit in the topological vacuum of a Harper-Hofstadter topological lattice [5]. To achieve this, we assemble a square lattice of niobium superconducting resonators [6] and break time-reversal symmetry by introducing ferrimagnets [7] before coupling the system to a single transmon qubit. We spectroscopically resolve the individual bulk and edge modes of this lattice, detect vacuumstimulated Rabi oscillations between the excited transmon and each mode, and thereby measure the synthetic-vacuum-induced Lamb shift of the transmon. Finally, we demonstrate the ability to employ the transmon to count individual photons [8] within each mode of the topological band structure. This work opens the field of chiral quantum optics experiment [9], suggesting new routes to topological many-body physics [10,11] and offering unique approaches to backscatter-resilient quantum communication.

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6569 Background: The Coleman Supportive Oncology Collaborative for Adolescents and Young Adults (CSOC AYA) is a multi-institution Chicago-based quality improvement collaborative consisting of representation from AYA-focused oncology teams at six hospitals and national patient advocacy organizations. Coping with cancer as an AYA is challenging given their complex and unique phases of life and dichotomy between pediatric and adult care. AYAs with cancer are a recognized underserved population within the cancer community and have unique supportive care needs that are often unmet. The CSOC AYA focuses on improving access to resources for supportive care. Methods: We implemented an online survey across six cancer treatment centers (5 academic, 1 community) engaging 50 AYAs. Participants were newly diagnosed (2), currently on treatment (18), or off treatment (30). Participant age range was representative of AYAs ( < 18years: 2%, 18 – 24: 36%, 25 – 34: 55%, and 35-39: 7%). Reported race was 60% Caucasian, 10% Black, 18% Latino, 8% Asian, 2% American Indian, and 2% other. Questions were asked to inform which supportive resources were desired by patients, when the resources would be most useful during the care continuum, and the preferred methods to receive information. Results: Greater than 54% percent of respondents desire social/emotional resources and peer connection at diagnosis. During treatment and after treatment, > 71% and > 56% respectively, desire guidance regarding nutrition/diet and physical activity/exercise, in addition to social/emotional support and peer connection (See table). Preferred methods to receive information were identified: 72% via email or text, 60% in person, and 45% via a patient portal. Conclusions: The CSOC AYA survey identified the type of supportive care resources AYAs need, when they are wanted, and their preferred methods for receiving them. Optimizing accessibility and availability of supportive care resources can enable AYA self-management and has the potential to improve quality of life. These survey results will serve as the basis for a patient-facing online intervention implemented throughout the care continuum with the intent to improve supportive care access for AYAs with cancer. [Table: see text]