Benchmarking a Quantum Teleportation Protocol in Superconducting Circuits Using Tomography and an Entanglement Witness

被引：68

作者：

Baur, M. ^{[1
]}

Fedorov, A. ^{[1
]}

Steffen, L. ^{[1
]}

Filipp, S. ^{[1
]}

da Silva, M. P. ^{[2
,3
]}

Wallraff, A. ^{[1
]}

机构：

[1] ETH, Dept Phys, CH-8093 Zurich, Switzerland

[2] Raytheon BBN Technol, Disrupt Informat Proc Technol Grp, Cambridge, MA 02138 USA

[3] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 04期

基金：

瑞士国家科学基金会;

关键词：

PODOLSKY-ROSEN CHANNELS; QUBITS; STATE; OPERATIONS; ATOMS;

D O I：

10.1103/PhysRevLett.108.040502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Teleportation of a quantum state may be used for distributing entanglement between distant qubits in quantum communication and for quantum computation. Here we demonstrate the implementation of a teleportation protocol, up to the single-shot measurement step, with superconducting qubits coupled to a microwave resonator. Using full quantum state tomography and evaluating an entanglement witness, we show that the protocol generates a genuine tripartite entangled state of all three qubits. Calculating the projection of the measured density matrix onto the basis states of two qubits allows us to reconstruct the teleported state. Repeating this procedure for a complete set of input states we find an average output state fidelity of 86%.

引用

页数：5

共 37 条

[1] Computation by measurements: A unifying picture [J].