Impedance-matched cavity quantum memory
Mikael Afzelius, Christoph Simon
TL;DR
This paper proposes an impedance-matched cavity quantum memory using an atomic frequency comb inside an asymmetric optical cavity, enabling near-perfect light absorption and high-efficiency quantum storage limited mainly by atomic dephasing.
Contribution
It introduces a novel impedance matching condition in cavity quantum memories that allows complete light absorption with minimal optical depth, enhancing efficiency.
Findings
Complete light absorption at optical depth of one
Efficiency limited mainly by atomic dephasing
Potential for near-unit efficiency quantum memories
Abstract
We consider an atomic frequency comb based quantum memory inside an asymmetric optical cavity. In this configuration it is possible to absorb the input light completely in a system with an effective optical depth of one, provided that the absorption per cavity round trip exactly matches the transmission of the coupling mirror ("impedance matching"). We show that the impedance matching results in a readout efficiency only limited by irreversible atomic dephasing, whose effect can be made very small in systems with large inhomogeneous broadening. Our proposal opens up an attractive route towards quantum memories with close to unit efficiency.
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