7 papers
Pulsed control of an entanglement-breaking index: thermal valleys, a certified valve, and its open-close asymmetry
Eran Kopel
The entanglement-breaking index of a channel is the number of self-compositions after which all entanglement with a reference system is destroyed. In a thermal qubit collision loop…
Pre-registered spectral and certified mixing analysis of the male Drosophila central nervous system connectome
Eran Kopel
We report a pre-registered test of five hypotheses about the synapse-flow random walk on the connectome of the male Drosophila central nervous system (166,700 neurons, 124 million…
Measuring the entanglement-breaking index of a qubit collision channel on a quantum processor: protocol and worked example
Eran Kopel
The entanglement-breaking index of a quantum channel is the smallest number of self-compositions after which the channel destroys all entanglement with any reference system. A phot…
The quantum lifetime of a future-referential feedback loop: certified index, architecture floor, and thermal bonus
Eran Kopel
A quantum feedback loop that returns information from a forward simulation to an earlier internal time induces a completely positive trace-preserving map on a message register; ite…
A sharp norm inequality for entanglement-breaking channels
Eran Kopel
For a channel on written in the generalised Bloch parameterisation , we prove that entanglement breaking implies $\|A\|_*^2 + \frac{d(d-1)}{2}\,|c|^2 \;\l…
How many labels can a biological oscillator carry? A quality-factor screen for proposed information carriers
Eran Kopel
How many distinguishable labels can a biological oscillator carry? Proposals invoking collective vibrational modes, endogenous electromagnetic fields, microtubule excitations and o…
Entanglement breaking in self-referential quantum feedback: a record bound and an exactly solvable loop
Eran Kopel
A feedback loop that returns a message into the process it describes defines a quantum channel on the message. We ask when such a loop preserves entanglement with a reference, that…