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
Extensible Technology for a Medium-Scale Superconducting Quantum Processor
Summary Superconducting quantum bits, or qubits, use circuits made from superconducting materials to harness quantum mechanical states. These devices contain many atoms, but can behave as simple, controllable qubits. We are building technologies for the control and measurement of superconducting qubits to enable the first demonstration of an extensible, medium-scale quantum processor. Our approach […]
November 28, 2016
Development of Terahertz Polariton Lasers
Theoretical and experimental results show that the polariton lasing mechanism is a promising basis for a compact, efficient source of terahertz radiation.
July 1, 2017
Distributing Multimode Entanglement with Microwave Photons
Microwaves have enabled numerous classical technologies, in part because they propagate through air with little energy loss.
March 6, 2017
Applications of Neutron Interferometry and Structured Neutron Beams
Summary Neutrons are a powerful probe of matter and physics due to their Angstrom size wavelengths, electric neutrality and relatively large mass. In this project, we develop quantum sensors that exploit these attributes to increases the precision of measurements of fundamental forces and materials structure. With David Cory, Alexander Cronin of the University of Arizona, […]
July 31, 2018