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Magnon dark modes and gradient memory.

Zhang X, Zou CL, Zhu N, Marquardt F, Jiang L, Tang HX - Nat Commun (2015)

Bottom Line: Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved.Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime.Our findings provide a promising approach for developing long-lifetime, multimode quantum memories.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.

ABSTRACT
Extensive efforts have been expended in developing hybrid quantum systems to overcome the short coherence time of superconducting circuits by introducing the naturally long-lived spin degree of freedom. Among all the possible materials, single-crystal yttrium iron garnet has shown up recently as a promising candidate for hybrid systems, and various highly coherent interactions, including strong and even ultrastrong coupling, have been demonstrated. One distinct advantage in these systems is that spins form well-defined magnon modes, which allows flexible and precise tuning. Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved. Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime. Our findings provide a promising approach for developing long-lifetime, multimode quantum memories.

No MeSH data available.


Multi-pulse storage in the MGM.Retrieved pulses for a double-pulse excitation. The two pulses are separated by 40 ns with a 15-ns duration each. Inset: double-pulse retrieval for various input frequencies at a bias field of 2,687 Oe.
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f4: Multi-pulse storage in the MGM.Retrieved pulses for a double-pulse excitation. The two pulses are separated by 40 ns with a 15-ns duration each. Inset: double-pulse retrieval for various input frequencies at a bias field of 2,687 Oe.

Mentions: Figure 4 plots the output of the MGM when two identical pulses are sent into the memory. Note that the MGM is under-coupled such that we can rely on the instantaneous reflection of the input pulse to control the pulse width and avoid overlap between the two pulses. In our linear system, the efficiency for the multimode operation remains the same as the single-pulse case. The two input pulses are 15 ns in duration and separated by 40 ns. Two pulses are retrieved from the memory after the pre-programmed storage time T=100 ns. As demonstrated in experiment (Fig. 4, inset), the multimode operation can also be achieved in a wide frequency range. The occasional pulse distortion at certain frequencies is a result of the non-ideality of the system such as the non-identical coupling strengths and decay rates of different YIG spheres, or the impact of the high-order magnon modes.


Magnon dark modes and gradient memory.

Zhang X, Zou CL, Zhu N, Marquardt F, Jiang L, Tang HX - Nat Commun (2015)

Multi-pulse storage in the MGM.Retrieved pulses for a double-pulse excitation. The two pulses are separated by 40 ns with a 15-ns duration each. Inset: double-pulse retrieval for various input frequencies at a bias field of 2,687 Oe.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660366&req=5

f4: Multi-pulse storage in the MGM.Retrieved pulses for a double-pulse excitation. The two pulses are separated by 40 ns with a 15-ns duration each. Inset: double-pulse retrieval for various input frequencies at a bias field of 2,687 Oe.
Mentions: Figure 4 plots the output of the MGM when two identical pulses are sent into the memory. Note that the MGM is under-coupled such that we can rely on the instantaneous reflection of the input pulse to control the pulse width and avoid overlap between the two pulses. In our linear system, the efficiency for the multimode operation remains the same as the single-pulse case. The two input pulses are 15 ns in duration and separated by 40 ns. Two pulses are retrieved from the memory after the pre-programmed storage time T=100 ns. As demonstrated in experiment (Fig. 4, inset), the multimode operation can also be achieved in a wide frequency range. The occasional pulse distortion at certain frequencies is a result of the non-ideality of the system such as the non-identical coupling strengths and decay rates of different YIG spheres, or the impact of the high-order magnon modes.

Bottom Line: Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved.Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime.Our findings provide a promising approach for developing long-lifetime, multimode quantum memories.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.

ABSTRACT
Extensive efforts have been expended in developing hybrid quantum systems to overcome the short coherence time of superconducting circuits by introducing the naturally long-lived spin degree of freedom. Among all the possible materials, single-crystal yttrium iron garnet has shown up recently as a promising candidate for hybrid systems, and various highly coherent interactions, including strong and even ultrastrong coupling, have been demonstrated. One distinct advantage in these systems is that spins form well-defined magnon modes, which allows flexible and precise tuning. Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved. Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime. Our findings provide a promising approach for developing long-lifetime, multimode quantum memories.

No MeSH data available.