  As larger, higher-quality quantum devices are built and demonstrated in
quantum information applications, such as quantum computation and quantum
communication, the need for high-quality quantum memories to store quantum
states becomes ever more pressing. Future quantum devices likely will use a
variety of physical hardware, some being used primarily for processing of
quantum information and others for storage. Here, we study the correlation of
the structure of quantum information with physical noise models of various
possible quantum memory implementations. Through numerical simulation of
different noise models and approximate analytical formulas applied to a variety
of interesting quantum states, we provide comparisons between quantum hardware
with different structure, including both qubit- and qudit-based quantum
memories. Our findings point to simple, experimentally relevant formulas for
the relative lifetimes of quantum information in different quantum memories and
have relevance to the design of hybrid quantum devices.
