A Fock State Detector for Qubit Measurement

Abstracts: Superconducting qubits are now routinely monitored with high fidelity using coherent cavity pulses and linear amplifiers. However, when entangling remote qubits via joint measurement - a very desirable quantum information primitive - these amplifiers are required to possess nearly perfect quantum efficiency. On the other hand, protocols based on flying Fock states can be constructed which tolerate arbitrarily low transmission, trading success rate for state preparation fidelity. I will discuss current and upcoming experiments using existing cQED tools to generate concurrent remote entanglement via microwave Fock state detectors.