A Medium-Distance Quantum Network with Fiber-Ready Trapped Atomic Ions
Abstract
Over the past few years we have seen an enormous advance in quantum technology with small programmable multi-qubit quantum computers realized on different technology platforms. Just as with classical computers, their true power will only be unlocked once these devices are linked in a network. Therefore, the next frontier for quantum computers, and quantum technology more widely, is connecting distant quantum nodes using telecom photons as information carriers. Ongoing efforts aim to convert entangled photons to fiber-amenable wavelengths, so far with low efficiency and high noise. We propose to implement a new experimental method based on direct ion-photon transmission from Strontium ions which will allow for the establishment of medium-distance quantum links, and open up the study and development of networked quantum technology capabilities in the near term. In this proposal we lay out an experimental campaign to be conducted at the Joint Quantum Institute at the University of Maryland to establish the viability of this new method. Starting with the construction of a new experimental apparatus, the ability to trap and hold Strontium ions will be achieved, together with techniques for preparation and readout of their electronic quantum state. Following that, an ion will be made to emit single photons at 1092 nm which is a wavelength amenable to fiber transmission over medium to large distances. The polarization state of such a photon is entangled with the quantum state of the emitting ion. We will verify this entanglement and show that it persists even after transmission through a long fiber (5 km). To study the extensibility of these ideas to a multi-node network we will explore plans to set up additional experiments and create remote entanglement between them using photon coincidence on a beam splitter. This project has the potential to steer the prevailing game for plan quantum networks, at least on the scale of a city, in a whole new direction
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 25, 2019
- Source ID
- W911NF1910296
Entities
People
- Norbert M Linke
Organizations
- Army Contracting Command
- United States Army
- University of Maryland