Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One-step implementation of a hybrid Fredkin gate with quantum memories
  and single superconducting qubit in circuit QED and its applications   In a recent remarkable experiment [R. B. Patel et al., Science advances 2,
e1501531 (2016)], a 3-qubit quantum Fredkin (i.e., controlled-SWAP) gate was
demonstrated by using linear optics. Here we propose a simple experimental
scheme by utilizing the dispersive interaction in superconducting quantum
circuit to implement a hybrid Fredkin gate with a superconducting flux qubit as
the control qubit and two separated quantum memories as the target qudits. The
quantum memories considered here are prepared by the superconducting coplanar
waveguide resonators or nitrogen-vacancy center ensembles. In particular, it is
shown that this Fredkin gate can be realized using a single-step operation and
more importantly, each target qudit can be in an arbitrary state with arbitrary
degrees of freedom. Furthermore, we show that this experimental scheme has many
potential applications in quantum computation and quantum information
processing such as generating arbitrary entangled states (discrete-variable
states or continuous-variable states) of the two memories, measuring the
fidelity and the entanglement between the two memories. With state-of-the-art
circuit QED technology, the numerical simulation is performed to demonstrate
that two-memory NOON states, entangled coherent states, and entangled cat
states can be efficiently synthesized.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc