# Direct measurement of concurrence for atomic two-qubit pure states

## Abstract

We propose a general scheme to measure the concurrence of an arbitrary two-qubit pure state in atomic systems. The protocol is based on one- and two-qubit operations acting on two available copies of the bipartite system, and followed by a global qubit readout. We show that it is possible to encode the concurrence in the probability of finding all atomic qubits in the ground state. Two possible scenarios are considered: atoms crossing three-dimensional microwave cavities and trapped ion systems.

- Authors:

- Departamento de Fisica, Universidad de Santiago de Chile, Casilla 307 Correo 2, Santiago (Chile)
- Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universitaet, Theresienstrasse 37, D-80333 Munich (Germany)
- (Peru)

- Publication Date:

- OSTI Identifier:
- 20982249

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.032303; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; GROUND STATES; IONS; MICROWAVE RADIATION; PROBABILITY; QUANTUM COMPUTERS; QUANTUM ENTANGLEMENT; QUBITS; THREE-DIMENSIONAL CALCULATIONS; TRAPPING

### Citation Formats

```
Romero, G., Lopez, C. E., Lastra, F., Retamal, J. C., Solano, E., and Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima.
```*Direct measurement of concurrence for atomic two-qubit pure states*. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVA.75.032303.

```
Romero, G., Lopez, C. E., Lastra, F., Retamal, J. C., Solano, E., & Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima.
```*Direct measurement of concurrence for atomic two-qubit pure states*. United States. doi:10.1103/PHYSREVA.75.032303.

```
Romero, G., Lopez, C. E., Lastra, F., Retamal, J. C., Solano, E., and Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima. Thu .
"Direct measurement of concurrence for atomic two-qubit pure states". United States.
doi:10.1103/PHYSREVA.75.032303.
```

```
@article{osti_20982249,
```

title = {Direct measurement of concurrence for atomic two-qubit pure states},

author = {Romero, G. and Lopez, C. E. and Lastra, F. and Retamal, J. C. and Solano, E. and Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima},

abstractNote = {We propose a general scheme to measure the concurrence of an arbitrary two-qubit pure state in atomic systems. The protocol is based on one- and two-qubit operations acting on two available copies of the bipartite system, and followed by a global qubit readout. We show that it is possible to encode the concurrence in the probability of finding all atomic qubits in the ground state. Two possible scenarios are considered: atoms crossing three-dimensional microwave cavities and trapped ion systems.},

doi = {10.1103/PHYSREVA.75.032303},

journal = {Physical Review. A},

number = 3,

volume = 75,

place = {United States},

year = {Thu Mar 15 00:00:00 EDT 2007},

month = {Thu Mar 15 00:00:00 EDT 2007}

}

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