Holographic Quantum Computing

Abstract

We propose to use a single mesoscopic ensemble of trapped polar molecules for quantum computing. A "holographic quantum register" with hundreds of qubits is encoded in collective excitations with definite spatial phase variations. Each phase pattern is uniquely addressed by optical Raman processes with classical optical fields, while one-and two-qubit gates and qubit read-out are accomplished by transferring the qubit states to a stripline microwave cavity field and a Cooper pair box where controllable two-level unitary dynamics and detection is governed by classical microwave fields.PACS numbers: 03.67. Lx, 33.90.+h, 85.25.Cp, 42.70.Ln In classical computer science holographic data storage is poised to provide the next generation in digital media [1,2]. The defining characteristic of this method is that information is stored globally rather than on specific sites in a storage medium. Current investigations of quantum memory components include similar ideas for storage of optical information in ensembles of atoms [3,4,5,6] and molecules [7].In the quantum version of holographic storage one can envisage N atoms or molecules in a lattice initially all populating the same internal quantum state |g [see Fig. 1(b)]. The quantum information in an incident weak field Ω 1 e i k1· x is, by the assistance of a control field Ω 2 (t)e

An efficient quantum light–matter interface with sub-second lifetime

“…Longer storage time will be possible by using dynamical decoupling [15]. Besides, as the optical lattice tightly confines atoms in all directions, our system has a feasible spatial multiplexing capacity [28,29] with long lifetime. In order to realize a practical quantum repeater, coupling losses have to be minimized and telecom interface with high efficiency should be integrated.…”

Quantum storage via refractive-index control

“…As well as providing an interesting possibility for storage, the refractive index control may also be useful for optimizing multiplexing regimes of multimode quantum memories, development of which is important in the prospect of both quantum communication [25,26] and computation [27]. Particularly, multimode memories can significantly increase the quantum communication rate for short storage times.…”

Quantum correlation switches for dipole arrays

“…[15][16][17][18][19] Since polar molecules integrate the advantages of both neutral atoms and trapped ions, i.e., a long coherence time and strong dipoledipole interactions, respectively, they were chosen as a promising new platform for hybrid quantum computing and simulation protocols concerning solid-state device, microwave field, and molecular ensembles simultaneously. [20][21][22][23] Furthermore, some quantum computing schemes with polar molecules serving as the physical carrier of quantum information were suggested in Refs. [24]- [29].…”