Chiral quantum optics with superconducting qubits
Abstract
Quantum computing holds the potential to improve our ability to solve computational tasks for a wide range of applications. However, scaling quantum computers to the size and interconnectivity required for solving practical problems is a significant and ongoing challenge. With continued progress in increasing the complexity of prototypical quantum machines, it is anticipated that a modular architecture will become essential for scaling. In this paradigm, medium-sized quantum processors will be interconnected via communication links to form larger distributed systems. To realize this vision, reliable communication links that can faithfully transfer quantum information across many length scales are essential, spanning from millimeters on a chip to tens of meters between the low-temperature environments housing the processors. This project focuses on advancing quantum interconnects for superconducting qubits. Towards this goal, we aim to establish remote entanglement- a valuable resource for quantum communication- via directional photon exchange between qubits connected by a one-dimensional open radiation channel. The unidirectional information flow, also known as chirality, enables several key functionalities in our approach. Most importantly, remote entanglement can be created and continuously protected against dissipation and decoherence from the environment in a chiral qubit-waveguide system. Additionally, this approach is readably extendible to large arrays of qubits, where multipartite entanglement can be established between several nodes connected by a waveguide and `programmed# in a reconfigurable fashion. Our project builds upon recent success in demonstrating chiral photon interfaces for superconducting qubits and lays out a systematic plan to bring these concepts, which have been so far unrealized, into the realm of reality. The project starts with the development of a scalable hardware platform for chirality and is followed by a series of experiments to generate and characterize two- and multi-qubit entangled states. Additionally, we use the realized platform to conduct experiments investigating the chiral propagation of microwave #light# though artificial quantum matter realized by superconducting qubits. We anticipate a host of novel phenomena to be within the grasp of experimental investigation with this system, including the decomposition of classical pulses into temporally resolved wave packets containing definite numbers of photons. Successful realization of this project will enable new methods of interqubit connectivity with unprecedented robustness against dissipation and decoherence, superior reconfigurability and potentially longer range. Beyond modular quantum computing, these capabilities may find applications in future experiments in distributed quantum sensing and quantum simulation of dissipative open systems. Approved for public release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 15, 2023
- Source ID
- N000142412052
Entities
People
- Mohammad Mirhosseini
Organizations
- California Institute of Technology
- Office of Naval Research
- United States Navy