This book explains the group representation theory for quantum
theory in the language of quantum theory. As is well known, group
representation theory is very strong tool for quantum theory, in
particular, angular momentum, hydrogen-type Hamiltonian, spin-orbit
interaction, quark model, quantum optics, and quantum information
processing including quantum error correction. To describe a big
picture of application of representation theory to quantum theory,
the book needs to contain the following six topics, permutation
group, SU(2) and SU(d), Heisenberg representation, squeezing
operation, Discrete Heisenberg representation, and the relation
with Fourier transform from a unified viewpoint by including
projective representation. Unfortunately, although there are so
many good mathematical books for a part of six topics, no book
contains all of these topics because they are too segmentalized.
Further, some of them are written in an abstract way in
mathematical style and, often, the materials are too segmented. At
least, the notation is not familiar to people working with quantum
theory. Others are good elementary books, but do not deal with
topics related to quantum theory. In particular, such elementary
books do not cover projective representation, which is more
important in quantum theory. On the other hand, there are several
books for physicists. However, these books are too simple and lack
the detailed discussion. Hence, they are not useful for advanced
study even in physics. To resolve this issue, this book starts with
the basic mathematics for quantum theory. Then, it introduces the
basics of group representation and discusses the case of the finite
groups, the symmetric group, e.g. Next, this book discusses Lie
group and Lie algebra. This part starts with the basics knowledge,
and proceeds to the special groups, e.g., SU(2), SU(1,1), and
SU(d). After the special groups, it explains concrete applications
to physical systems, e.g., angular momentum, hydrogen-type
Hamiltonian, spin-orbit interaction, and quark model. Then, it
proceeds to the general theory for Lie group and Lie algebra. Using
this knowledge, this book explains the Bosonic system, which has
the symmetries of Heisenberg group and the squeezing symmetry by
SL(2,R) and Sp(2n,R). Finally, as the discrete version, this book
treats the discrete Heisenberg representation which is related to
quantum error correction. To enhance readers' undersnding, this
book contains 54 figures, 23 tables, and 111 exercises with
solutions.
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