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Quantum amplification of boson-mediated interactions



Shaun C. Burd, Raghavendra Srinivas, Hannah M. Knaack, Wenchao Ge, Andrew C. Wilson, David J. Wineland, Dietrich Leibfried, John J. Bollinger, David T. Allcock, Daniel Slichter


Strong and precisely controlled interactions between quantum objects are essential for quantum information processing\citeSackett2000,Majer2007}, simulation\citeBritton2012}, and sensing\citeHosten2016a,Cox2016}, and for the formation of exotic quantum matter\citeBloch2008}. A well-established paradigm for coupling otherwise weakly interacting quantum objects is to use auxiliary bosonic quantum particles to mediate the interactions. Important examples include photon-mediated interactions between atoms\citeGerry2005}, superconducting qubits\citeBlais2004}, and color centers in diamond\citeEvans2018}, and phonon-mediated interactions between trapped ions\citeCirac1995,Sorensen1999,Milburn2000} and optical and microwave photons\citeHigginbotham2018}. General methods for amplifying these interactions through parametric driving of the boson channel\textemdash crucially, the drive need not couple directly to the interacting quantum objects\textemdash have been proposed for a variety of quantum platforms\citeLu2015,Lemonde2016,Zeytino2017,Qin2018,Chen2019,Leroux2018,Arenz2018,Ge2019, Ge2019b, Groszkowski2020, Li2020}, but have not to date 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\citeGe2019}. The amplified interaction enables a 3.3-fold increase in the effective interaction strength, as determined by measuring the speedup 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.


Squeezing, trapped ion, quantum information processing, entanglement


Burd, S. , Srinivas, R. , Knaack, H. , Ge, W. , Wilson, A. , Wineland, D. , Leibfried, D. , Bollinger, J. , Allcock, D. and Slichter, D. (2021), Quantum amplification of boson-mediated interactions, Nature, [online],, (Accessed August 12, 2022)
Created May 13, 2021, Updated February 23, 2022