Summary
Mesoscopic systems provide a new tool for quantum systems design. In particular, they are enabling of robust quantum control. Here “mesoscopic system” refers to a connected network where each element, if studied alone, would be a quantum bit. The network is too big to be treated fully quantum mechanically. We do not have individual control over each element and we measure collective properties of the network. However, the network retains quantum coherence and behaves in a uniquely quantum fashion. In this project, we design a novel protocol using an intermediate mesoscopic system to control and interconnect non-interacting qubits. Our method aims to create entanglement between two separated qubits; a pure quantum correlation between the target qubits that provides a measure of the mesoscopic system’s quantum capacity. Over the course of this project, we will develop new theory and experimental tools. Ultimately, we expect our work will lead to innovative design elements for use in quantum processor architectures and quantum measurement devices.
Figure 1: The summary of the entangling protocol: (a) The experimentally available control tools are used to correlate two joint logical states of the target with two very distinct collective states of the mesoscopic system, (b) A low-resolution global measurement over the mesoscopic system discerns between the distinct collective states of the mesoscopic system. This measurement updates the state of the qubits into one of the two logical joint states, each with a probability of ½, along with the state of the mesoscopic system. Both of these joint logical states are maximally entangled quantum states between the target qubits.
Related Content
Photonic Quantum Processor
Photonic quantum processors based on integrated quantum photonic circuits require entangled photon pairs to perform quantum computations. However, current state-of-the-art technologies utilize probabilistic entangled photon sources with limited pair-extraction efficiencies, negatively affecting the computation speed. This project aims to boost the speed of on-chip quantum operations by using bright, on-demand entangled photon sources with an […]
April 24, 2023
Hybrid Quantum Repeater based on Atomic Quantum Memories and Telecom Wavelength Entangled Photon-Pairs Generated from Semiconductor Nanowires
Summary Losses in physical channels, such as optical fibres, limit existing quantum communication systems to modest distance ranges. Since amplification of quantum signals is fundamentally not possible, we look to extend the range and functionality of these quantum channels by adding quantum memory nodes that can daisy-chain multiple lengths of quantum channels through entanglement […]
October 29, 2018
Materials for Majorana-based Topological Qubits
Summary Topological qubits offer a novel pathway to scalable quantum computing by simultaneously allowing for ease of coupling between qubits and strong decoupling of qubits from noise and dissipation. The most promising direction explores the topologically induced protection of theoretically predicted exotic quasiparticles, the so-called Majorana Zero Modes or MZMs. To-date MZMs, which follow […]
January 28, 2019
Quantum Material Multilayer Photonic Devices and Network
Summary Realizing highly integrated quantum photonic devices on a chip can enable new opportunities for photonic quantum computation. In this project, we explore heterostructures of stacked two-dimensional (2D) materials, such transition metal dichalcogenides (TMDC) or graphene, combined with optical microcavities as a platform for such devices. 2D materials are extremely thin and flexible, and have […]
December 12, 2019