Quantum communication between remote mechanical resonators

Abstract

Mechanical resonators represent one of the most promising candidates to mediate the interaction between different quantum technologies, bridging the gap between efficient quantum computation and long-distance quantum communication. In this letter, we introduce a novel interferometric scheme where the interaction of a mechanical resonator with input/output quantum pulses is controlled by an independent classical drive. We design protocols for state teleportation and direct quantum state transfer, between distant mechanical resonators. The proposed device, feasible with state-of-the-art technology, can serve as building block for the implementation of long-distance quantum networks of mechanical resonators.During the spectacular development of quantum technologies observed in the last decades, it has become clear that no single platform will emerge as the best candidate to perform the totality of all quantum information tasks [1]. For example, superconducting circuits [2] and atomic systems [3, 4] excel in quantum computation and quantum simulation. Photonic systems [5], among many other achievements, have proven able to implement quantum communication over unchallenged distances. The feasibility of building quantum systems of increasing size and complexity will strongly depend on our ability to develop a hybrid approach [6], exploiting different quantum technologies in large-scale quantum networks [7]. In this framework, micro-and nano-mechanical devices come through as potential links between different platforms, as they can be coupled to a plethora of different quantum systems [8][9][10]. So far, it has been experimentally explored the interaction of mechanical oscillators with ensembles of cold atoms [11], microwave and optical cavities [13][14][15][16][17][18][19][20], superconducting qubits [12], and single spins [21]. Using optomechanical devices, coherent conversion of microwave to optical photons [22, 23], and viceversa [24], has already been demonstrated.The interest in using mechanical resonators in quantum communication protocols has been steadily growing. Most recently, the interaction of mechanical resonators with travelling optical signals has been studied for the purpose of light-to-mechanical teleportation [28], qubit-to-light transduction [29], non-Gaussian state swapping [25], and entanglement generation [26,27]. Different schemes have been proposed to distribute entanglement among remote mechanical resonators [30,31]. However, a complete protocol for transferring arbitrary quantum states between distant mechanical resonators is still missing. In general, interconnecting remote quantum systems through propagating quantum signals is a highly challenging task. Quantum state transfer and teleportation have been realized for distant single atoms in a probabilistic way [32,33]. Quantum state teleportation has been implemented in a probabilistic fashion between distant trapped ions [34], as well as in a deterministic way between spatially separated atomic clouds [35].In this letter, we propose a nov...

Proposal for optomechanical quantum teleportation

“…Over the past few years, optomechanical devices have emerged as an interesting tool to explore quantum phenomena, both from a fundamental perspective, showing the limits of quantum mechanical rules on massive objects [11], as well as from an applied view, promising to act as efficient transducers connecting radio-frequency regime qubits to low-loss optical channels [12,13]. While continuous-variable teleportation using an optomechanical system has been proposed [14,15], an experimental realization of such a scheme remains beyond reach.…”

Fast and efficient deterministic quantum state transfer between two remote mechanical resonators

“…For the case in which a quantum state is transferred between the two mechanical modes, the pump lasers should be at the first red sideband. We, thus, take ∆ 0 = ω m ) as the working point from now on [34,38,45]. We begin the analysis by writing the Heisenberg equations of motion in the interaction picture [46]:…”

“…Hence, one mechanical resonator can act as a mediator for the QST between two optical modes [30,31]. Also, one can provide a three-mode system in which two mechanical modes couple to a common optical mode to realize the QST between the mechanical resonators based on the WPS approach [25,[32][33][34][35][36][37][38].…”

Parameter-dependent unitary transformation approach for quantum Rabi model

“…Such a simplest interacting quantum model has had wide applications in many fields of physics, e.g. atomic physics [2], quantum optics [3], trapped ions [4,5], quantum dots [6], superconducting qubits [7,8,9], cold atoms [10], and etc.. It is also expected to be the theoretical basis for quantum information and quantum technology [11][12][13][14].…”