Optimization of Broadband $\Lambda$-type Quantum Memory Using Gaussian
Pulses
- URL: http://arxiv.org/abs/2008.13638v4
- Date: Tue, 30 Mar 2021 15:43:36 GMT
- Title: Optimization of Broadband $\Lambda$-type Quantum Memory Using Gaussian
Pulses
- Authors: Kai Shinbrough, Benjamin Hunt, Virginia O. Lorenz
- Abstract summary: We show that for overlapping signal and control fields there exists a unique and broadband pulse duration that optimize the memory efficiency.
We further optimize over the control field temporal delay and pulse duration, demonstrating saturation of this efficiency bound over a broad range of pulse durations.
- Score: 0.7734726150561088
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Optical quantum memory--the ability to store photonic quantum states and
retrieve them on demand--is an essential resource for emerging quantum
technologies and photonic quantum information protocols. Simultaneously
achieving high efficiency and high-speed, broadband operation is an important
task necessary for enabling these applications. In this work, we investigate
the optimization of a large class of optical quantum memory protocols based on
resonant interaction with ensembles of $\Lambda$-type level systems with the
restriction that the temporal envelope of all optical fields must be Gaussian,
which reduces experimental complexity. We show that for overlapping signal and
control fields there exists a unique and broadband pulse duration that
optimizes the memory efficiency, and that this optimized efficiency can be
close to the protocol-independent bound. We further optimize over the control
field temporal delay and pulse duration, demonstrating saturation of this
efficiency bound over a broad range of pulse durations while clarifying the
underlying physics of the quantum memory interaction.
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