  In this paper, we propose the Quantum Data Center (QDC), an architecture
combining Quantum Random Access Memory (QRAM) and quantum networks. We give a
precise definition of QDC, and discuss its possible realizations and
extensions. We discuss applications of QDC in quantum computation, quantum
communication, and quantum sensing, with a primary focus on QDC for $T$-gate
resources, QDC for multi-party private quantum communication, and QDC for
distributed sensing through data compression. We show that QDC will provide
efficient, private, and fast services as a future version of data centers.
