Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Preparation of Logically Labeled Pure States with Only Two Turns for
  Bulk Quantum Computation   Quantum state preparation plays an equally important role with quantum
operations and measurements in quantum information processing. The previous
methods of preparing initial state for bulk quantum computation all have
inevitable disadvantages, such as, requiring multiple experiments, causing loss
of signals, or requiring molecules with restrictive structure. In this work,
three kinds of quantum circuits are introduced to prepare the pseudo-pure
states of ($n-1$) qubits in the Hilbert space of $n$ coupled spins which merely
need the assist of one ancilla spin and two experiments independent of $n$.
Being without gradient fields effectively avoids the reduction of the signals.
Our methods have no special requirements on the structure of the used
molecules. To test these methods more comprehensively, we experimentally
demonstrate the preparation of the labeled pseudo-pure states using
heteronuclear 2-qubit and homonuclear 4-qubit nuclear magnetic resonance
quantum information processor.

35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex