Teleportation-Based Controlled-NOT Gate for Fault-Tolerant Quantum Computation

Abstract

Quantum computers promise dramatic speed ups for many computational tasks. For large-scale quantum computation however, the inevitable coupling of physical qubits to the noisy environment imposes a major challenge for a real-life implementation. A scheme introduced by Gottesmann and Chuang can help to overcome this difficulty by performing universal quantum gates in a faulttolerant manner. Here, we report a non-trivial demonstration of this architecture by performing a teleportation-based two-qubit controlled-NOT gate through linear optics with a high-fidelity sixphoton interferometer. The obtained results clearly prove the involved working principles and the entangling capability of the gate. Our experiment represents an important step towards the feasibility of realistic quantum computers and could trigger many further applications in linear optics quantum information processing.

Teleportation between distant qudits via scattering of mobile qubits

“…Significantly, teleportation can be harnessed as a resource to perform universal quantum computation [5]. This model for computation is indeed a prominent example of the emerging paradigm of measurement-based quantum computation (MQC) [6] and is the focus of ongoing experimental work [11]. While most of the schemes to implement teleportation focused on Quantum Optics/Cavity Quantum Electrodynamics setups [7,8], proposals in solid-state scenarios have been put forward more recently [9].…”