# Preparation of Logically Labeled Pure States with Only Two Turns for Bulk Quantum Computation

## TL;DR

This paper introduces efficient quantum circuits for preparing pseudo-pure states in bulk quantum computation, requiring only two experiments and one ancilla spin, avoiding signal loss and structural constraints.

## Contribution

It presents three novel quantum circuits for state preparation that are experimentally demonstrated, requiring minimal experiments and no gradient fields.

## Key findings

- Successful preparation of labeled pseudo-pure states in 2-qubit NMR systems
- Preparation method is independent of molecular structure
- Avoids signal loss by eliminating gradient fields

## Abstract

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.