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Related Experiment Video

Updated: Mar 31, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum-secure covert communication on bosonic channels.

Boulat A Bash^1,2, Andrei H Gheorghe^1,3, Monika Patel¹

¹Quantum Information Processing Group, Raytheon BBN Technologies, 10 Moulton Street, Cambridge, Massachusetts 02138, USA.

Nature Communications

|October 20, 2015

Summary

This summary is machine-generated.

New research shows covert communication is possible even with channel noise. The amount of covert data is limited by the square root of available transmission modes, enabling stealthy communications against powerful adversaries.

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Area of Science:

Information theory
Quantum communication
Cryptography

Background:

Current encryption methods ensure message confidentiality but not transmission stealth.
Existing approaches do not address the detectability of communication signals.

Purpose of the Study:

To determine the ultimate limit of reliable and covert data transmission over a thermal-noise bosonic channel.
To establish fundamental bounds for stealthy communication in the presence of noise.

Main Methods:

Characterization of the lossy thermal-noise bosonic channel.
Theoretical analysis of covert communication capacity.
Proof-of-principle experimental demonstration.

Main Results:

The maximum number of reliably transmissible covert bits is proportional to the square root of the time-bandwidth product (number of orthogonal modes).
This limit holds when channel noise, like thermal noise, is uncontrollable by an adversary.
Experimental validation of the theoretical findings.

Conclusions:

Achieved covert communication is fundamentally limited by channel noise characteristics.
The findings provide a pathway to realizing communications undetectable by even a quantum adversary.
This work establishes a new paradigm for secure and stealthy information transmission.