Citation
Abstract
In order to optimize communication over a quantum channel for practical scenarios, we must deliver demanded classical and quantum resources with as little power as possible. We consider the problem of maximizing the photon information efficiency of free space optical communication over a single mode channel subject to time-varying demands for classical information. By drawing from results on the joint capacity region for transmitting classical information (bits), quantum information (qubits), and entanglement (ebits) over the lossy bosonic channel, we are able to formulate the problem as a discrete optimization. This enables us to explicitly compute the maximum photon information efficiency for a given demand profile, and the associated time-varying average photon numbers and rates of entanglement generation and consumption necessary to achieve it. Along the way, we derive a closed-form expression for the minimal average photon number necessary to achieve a particular rate pair of bit and ebit communication in the case of zero qubit communication. Our results yield examples where we can optimize our photon information efficiency by generating entanglement during times of low demand for classical information, and later use it to communicate bits at a lower average photon number during times of higher demand.
Keywords
Details
- Volume
- 42-233
- Published
- May 15, 2023
- Pages
- 1–20
- File Size
- 2.3 MB