Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient experimental estimation of fidelity of linear optical quantum
  Toffoli gate   We propose an efficiently measurable lower bound on quantum process fidelity
of N-qubit controlled-Z gates. This bound is determined by average output state
fidelities for N partially conjugate product bases. A distinct advantage of our
approach is that only fidelities with product states need to be measured while
keeping the total number of measurements much smaller than what is necessary
for full quantum process tomography. As an application, we use this method to
experimentally estimate quantum process fidelity F of a three-qubit linear
optical quantum Toffoli gate and we find that F>=0.83. We also demonstrate the
entangling capability of the gate by preparing GHZ-type three-qubit entangled
states from input product states.

12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin