Changes from 2.1.5 to 3.1
- Efficient functions for checking equivalence up to global
and relative phase of operators and states. The phase factors are
also computed by most of these functions. See the User's
Guide for details. The algorithms that these
functions are based on are described in George Viamontes' thesis.
Example scripts may be found in examples/phase_checks/
- Support for Dirac-style notation. See the User's Guide
for examples and details. Example scripts may be found in
- Support for string data types, including variable storage
and string manipulation, has been added. The User's Guide
has examples of this feature. This feature also makes
the cu_gate function much easier to use.
- New operators including +=, -=, *=, and /=
- Bit manipulation operators including << and >>. Also functions
to get and set individual bits of an integer variable have been
- Binary integer expressions are now supported using the bn syntax.
- The abs function has been added, which implements the complex
- Alternate syntax for the kron function in the form of the (X)
operator, which makes writing Dirac-style expressions more natural.
- Alternate syntax for the hadamard function. H is now syntactic
short-hand for it.
- Changed the matrix produced by sigma_z. It differs by a mutiple
of -1 from the old matrix produced. This is only a global phase
change, but several requests indicated that this version would
New example scripts
- New example scripts have been added which demonstrate all
of the new features.
- A C++ library and API are available to use QuIDDPro in C++
- A bug which degraded runtime and memory performance when
using loops and function calls within tight loops has been fixed.
- In some cases when multiplying a call to cu_gate with a state
vector, the state vector was modified incorrectly. This bug has
- Fixed the cnot and toffoli functions, which previously would
incorrectly modify state vectors in certain cases.
Changes from 2.1.4 to 2.1.5
- Fixed a bug in which variations of Toffoli gates (i.e.
controlled-NOT gates with two controls) would not modify
state vectors properly.
- Improved numerical precision.
Changes from 2.1.3 to 2.1.4
- Fixed a bug in which lazily created cu_gate operators
were all treated as controlled-NOT gates even if the
action specified in the cu_gate call was not X.
Changes from 2.1.2 to 2.1.3
- Improved performance on a few benchmarks, particularly
grover_density.qpro, by changing the DD hashing function
of terminal values.
- Fixed a bug which caused some imaginary values of complex
numbers within a matrix or vector to be off by -i or take
on slightly incorrect values. This fix in particular
affected calls to the rz function.
Changes from 2.1.1 to 2.1.2
- Fixed a bug which caused imaginary values of complex numbers within
a matrix or vector to be set to 0 when the real value was 0.
Changes from 2.1 to 2.1.1
- Fixed a bug which periodically caused the parser to crash when
certain calls to the state vector normalization function were made.
- Fixed a bug which caused incorrect values to be generated for state
Changes from 2.0 to 2.1
- Performance has been dramatically improved.
Changes from 1.2.1 to 2.0
Support for libraries
- Support for user-defined functions has been added. See Section 4 of the User's Guide for details.
- The run command has been added which executes the
script code contained in a separate file. This command is ideal for
declaring variables which may be re-used in multiple projects. See
Section 4 of the User's Guide for details.
- A swap function has been added which efficiently
swaps two qubits in a state vector. This function is much faster
than swapping the qubits explicitly using CNOT and Hadamard gates.
- A dump_dot function has been added which outputs a
file that can be converted into the graphical representation of a
QuIDD. Making use of this function requires the freely available
Graphviz package which can be obtained at http://www.graphviz.org/
- A quidd_info function has been added which outputs
information about an operator or density matrix. See Section
4 of the User's Guide for more details.
- Column entries in a matrix may be separated by
commas now in addition to whitespace.
New example scripts
- Examples have been added demonstrating user-defined functions and the run command.
Copyright © 2004, 2005, 2006, 2007 George F. Viamontes
, Igor L. Markov
, John P. Hayes
The Regents of the University of Michigan. All rights reserved.