Nonreciprocal photon transmission and amplification via reservoir engineering
The general desire to break reciprocity in engineered photonic structures has garnered an immense amount of recent interest. For example nonreciprocal microwave-frequency devices are crucial to efforts at quantum-information processing with superconducting circuits. We discuss a general method for constructing nonreciprocal, cavity-based photonic devices, based on matching a given coherent interaction with its corresponding dissipative counterpart; it generalizes the basic structure used in the theory of cascaded quantum systems. In contrast to interference-based schemes, our approach allows directional behaviour over a wide bandwidth. We show how it can be used to devise isolators and directional, quantum-limited ampliﬁers; of particular interest is a directional phase-sensitive ampliﬁer which is not limited by any fundamental gain-bandwidth constraint. Our approach is particularly well-suited to implementations using superconducting microwave circuits.
Host- Mohammad Hafezi
Subscribe to A Quantum Bit
Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...
Sign Up Now
Sign up to receive A Quantum Bit in your email!