Deterministic quantum teleportation of atomic qubits

Abstract

Quantum teleportation provides a means to transport quantum information efficiently from one location to another, without the physical transfer of the associated quantum-information carrier. This is achieved by using the non-local correlations of previously distributed, entangled quantum bits (qubits). Teleportation is expected to play an integral role in quantum communication and quantum computation. Previous experimental demonstrations have been implemented with optical systems that used both discrete and continuous variables, and with liquid-state nuclear magnetic resonance. Here we report unconditional teleportation of massive particle qubits using atomic (9Be+) ions confined in a segmented ion trap, which aids individual qubit addressing. We achieve an average fidelity of 78 per cent, which exceeds the fidelity of any protocol that does not use entanglement. This demonstration is also important because it incorporates most of the techniques necessary for scalable quantum information processing in an ion-trap system.

Temperature-independent teleportation of qubits in Davies environments

“…Nowadays, thanks to the rapid development of recent experimental work [3,23], teleportation is a part of modern science rather than fiction. Twenty years after inventing entanglement-based teleportation of qubits, the idea is often labeled as "simple."…”

Optimization of segmented linear Paul traps and transport of stored particles

“…Starting with two-qubit gate operations [2,3], long lived two-qubit entanglement [4,5,6], teleportation experiments [7,8], and different sorts of multi-qubit entangled states [9,10,4,11], the record for qubit-entanglement is currently presented in a 6-qubit cat state and a 8-qubit W-state [12,13]. Future improvement is expected using the technique of segmented linear Paul traps which allow to shuttle ions from a "processor" unit to a "memory" section [14].…”

Transport Dynamics of Single Ions in Segmented Microstructured Paul Trap Arrays

“…as used in recent experiments [5,14,15,16,22,23], consists typically of two alumina wafers with gold coated electrode surfaces of a few micrometer thickness. The slotted wafers provide electrical RF and DC fields for 3D confinement of ions.…”

“…To evaluate this expression one first must solve for the explicit time-dependence of ρ and µ according to Eqs. (12,14) by integrating the Ermakov equation and the phase equation, and finally compute the transferred energy at different times using Eqs. (19,20).…”

“…In the last few years methods were developed that enable quantum state engineering with high precision and long coherence times [7,8,9,10,11]. The necessary criteria [12] for large-scale quantum computation have been demonstrated in the past years, and small algorithms have been implemented successfully [13,14,15,16,17]. However, as in other approaches aiming towards quantum computation, scaling to many qubits is challenging.…”