Quantum amplification of boson-mediated interactions

Strong and precisely controlled interactions between quantum objects are essential for quantum information processing 1 , 2 , simulation 3 and sensing 4 , 5 , and for the formation of exotic quantum matter 6 . A well-established paradigm for coupling otherwise weakly interacting quantum objects is t...

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Bibliographic Details
Published in:Nature physics 2021-08, Vol.17 (8), p.898-902
Main Authors: Burd, S. C., Srinivas, R., Knaack, H. M., Ge, W., Wilson, A. C., Wineland, D. J., Leibfried, D., Bollinger, J. J., Allcock, D. T. C., Slichter, D. H.
Format: Article
Language:English
Subjects:
639/766/36
639/766/483/481
Amplification
Atomic
Classical and Continuum Physics
Color centers
Complex Systems
Condensed Matter Physics
Data processing
Diamonds
Driving ability
Letter
Magnetic fields
Mathematical and Computational Physics
Modulation
Molecular
Object recognition
Optical and Plasma Physics
Physics
Physics and Astronomy
Quantum phenomena
Qubits (quantum computing)
Stability
Theoretical
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Summary:Strong and precisely controlled interactions between quantum objects are essential for quantum information processing 1 , 2 , simulation 3 and sensing 4 , 5 , and for the formation of exotic quantum matter 6 . A well-established paradigm for coupling otherwise weakly interacting quantum objects is to use auxiliary bosonic quantum excitations to mediate the interactions. Important examples include photon-mediated interactions between atoms 7 , superconducting qubits 8 , and colour centres in diamond 9 , and phonon-mediated interactions between trapped ions 10 – 12 and between optical and microwave photons 13 . Boson-mediated interactions can, in principle, be amplified through parametric driving of the boson channel; the drive need not couple directly to the interacting quantum objects. This technique has been proposed for a variety of quantum platforms 14 – 24 , but has not, so far, been realized in the laboratory. Here we experimentally demonstrate the amplification of a boson-mediated interaction between two trapped-ion qubits by parametric modulation of the trapping potential 21 . The amplification provides up to a 3.25-fold increase in the interaction strength, validated by measuring the speed-up of two-qubit entangling gates. This amplification technique can be used in any quantum platform where parametric modulation of the boson channel is possible, enabling exploration of new parameter regimes and enhanced quantum information processing. Many applications of quantum systems require them to be joined by strong, controllable interactions. Exploiting the physics of quantum squeezing can amplify the strength of boson-mediated interactions, yielding higher performance.
ISSN:1745-2473
1745-2481
DOI:10.1038/s41567-021-01237-9