Publications
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2019
Squeezed Vacuum Used to Accelerate the Search for a Weak Classical Signal
M. Malnou, D.A. Palken, B.M. Brubaker, L.R. Vale, G.C. Hilton, K.W. Lehnert, Phys. Rev. X 9, 021023 (2019).
Design of an On-Chip Superconducting Microwave Circulator with Octave Bandwidth
B.J. Chapman, E.I. Rosenthal, K.W. Lehnert, Phys. Rev. Applied 11, 044048 (2019).
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2018
Optimal Operation of a Josephson Parametric Amplifier for Vacuum Squeezing
M. Malnou, D.A. Palken, L.R. Vale, G.C. Hilton, K.W. Lehnert, Phys. Rev. Applied 9, 044023 (2018).Phonon-Number-Sensitive Electromechanics
J.J. Viennot, X. Ma, K.W. Lehnert, Phys. Rev. Lett. 121, 183601 (2018).
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Featured in Physics https://physics.aps.org/articles/v11/109
Harnessing electro-optic correlations in an efficient mechanical converter
A.P. Higginbotham, P.S. Burns, M.D. Urmey, R.W. Peterson, N.S. Kampel, B.M. Brubaker, G. Smith, K.W. Lehnert, C.A. Regal, Nature Physics, (2018).Topological phase transition measured in a dissipative metamaterial
E.I. Rosenthal, N.K. Ehrlich, M.S. Rudner, A.P. Higginbotham, K.W. Lehnert, Phys. Rev. B 97, 220301 (2018).Cavity Quantum Acoustic Device in the Multimode Strong Coupling Regime
B.A. Moores, L.R. Sletten, J.J. Viennot, K.W. Lehnert, Phys. Rev. Lett. 120, 227701 (2018).Results from phase 1 of the HAYSTAC microwave cavity axion experiment
L. Zhong, A. Kenany, K.M. Backes, B.M. Brubaker, S.B. Cahn, G. Carosi, Y.V. Gurevich, W.F. Kindel, S.K. Lamoreaux, K.W. Lehnert, S.M. Lewis, M. Malnou, R.H. Maruyama, D.A. Palken, N.M. Rapidis, J.R. Root, M. Simanovskaia, T.M. Shokair, D.H. Speller, I. Urdinaran, K.A. van Bibber, Phys. Rev. D 97, 092001 (2018).2017
First Results from a Microwave Cavity Axion Search at 24 micro-eV
B.M. Brubaker, L. Zhong, Y.V. Gurevich, S.B. Cahn, S.K. Lamoreaux, M. Simanovskaia, J.R. Root, S.M. Lewis, A. Kenany, K.M. Backes, I. Urdinaran, N.M. Rapidis, T.M. Shokair, K.A. van Bibber, D.A. Palken, M. Malnou, W.F. Kindel, M.A. Anil, K.W. Lehnert, G. Carosi, Phys. Rev. Lett. 118, 061302 (2017).
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Improving Broadband Displacement Detection with Quantum Correlations
N.S. Kampel, R.W. Peterson, R. Fischer, P.L. Yu, K. Cicak, R.W. Simmonds, K.W. Lehnert, C.A. Regal, Phys. Rev. X 7, 021008 (2017).
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HAYSTAC axion search analysis procedure
B.M. Brubaker, L. Zhong, S.K. Lamoreaux, K.W. Lehnert, K.A. van Bibber, Phys. Rev. D 96, 123008 (2017).Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits
B.J. Chapman, E.I. Rosenthal, J. Kerckhoff, B.A. Moores, L.R. Vale, J.A.B. Mates, G.C. Hilton, K. Lalumière, A. Blais, K.W. Lehnert, Phys. Rev. X 7, 041043 (2017).
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Breaking Lorentz Reciprocity with Frequency Conversion and Delay
E.I. Rosenthal, B.J. Chapman, A.P. Higginbotham, J. Kerckhoff, K.W. Lehnert, Phys. Rev. Lett. 119, 147703 (2017).Faithful conversion of propagating quantum information to mechanical motion
A.P. Reed, K.H. Mayer, J.D. Teufel, L.D. Burkhart, W. Pfaff, M. Reagor, L. Sletten, X. Ma, R.J. Schoelkopf, E. Knill, K.W. Lehnert, Nature Physics 13, 1163–1167 (2017).DOI: 10.1038/nphys4251
Single-sideband modulator for frequency domain multiplexing of superconducting qubit readout
B.J. Chapman, E.I. Rosenthal, J. Kerckhoff, L.R. Vale, G.C. Hilton, K.W. Lehnert, Applied Physics Letters 110, 162601 (2017).DOI: 10.1063/1.4981390
Reconfigurable re-entrant cavity for wireless coupling to an electro-optomechanical device
T. Menke, P.S. Burns, A.P. Higginbotham, N.S. Kampel, R.W. Peterson, K. Cicak, R.W. Simmonds, C.A. Regal, K.W. Lehnert, Review of Scientific Instruments 88, 094701 (2017).DOI: 10.1063/1.5000973
Design and operational experience of a microwave cavity axion detector for the 20 - 100 micro-eV range
A. Kenany, M.A. Anil, K.M. Backes, B.M. Brubaker, S.B. Cahn, G. Carosi, Y.V. Gurevich, W.F. Kindel, S.K. Lamoreaux, K.W. Lehnert, S.M. Lewis, M. Malnou, D.A. Palken, N.M. Rapidis, J.R. Root, M. Simanovskaia, T.M. Shokair, I. Urdinaran, K.A. van Bibber, L. Zhong, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 854, 11 - 24 (2017).2016
Generation and efficient measurement of single photons from fixed-frequency superconducting qubits
W.F. Kindel, M.D. Schroer, K.W. Lehnert, Phys. Rev. A 93, 033817 (2016).Closing a quantum feedback loop inside a cryostat: Autonomous state preparation and long-time memory of a superconducting qubit
C.Kraglund Andersen, J. Kerckhoff, K.W. Lehnert, B.J. Chapman, K. Mølmer, Phys. Rev. A 93, 012346 (2016).
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Laser Cooling of a Micromechanical Membrane to the Quantum Backaction Limit
R.W. Peterson, T.P. Purdy, N.S. Kampel, R.W. Andrews, P.L. Yu, K.W. Lehnert, C.A. Regal, Phys. Rev. Lett. 116, 063601 (2016).
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Proposal to Test Bell's Inequality in Electromechanics
S.G. Hofer, K.W. Lehnert, K. Hammerer, Phys. Rev. Lett. 116, 070406 (2016).Photon Efficient Electro-Optic Conversion via a Micromechanical Oscillator
K.W. Lehnert, C.A. Regal, R.W. Peterson, N.S. Kampel, P.S. Burns, A.P. Higginbotham, Conference on Lasers and Electro-Optics, (2016).General purpose multiplexing device for cryogenic microwave systems
B.J. Chapman, B.A. Moores, E.I. Rosenthal, J. Kerckhoff, K.W. Lehnert, Applied Physics Letters 108, (2016).DOI: 10.1063/1.4952772
2015
On-Chip Superconducting Microwave Circulator from Synthetic Rotation
J. Kerckhoff, K. Lalumière, B.J. Chapman, A. Blais, K.W. Lehnert, Phys. Rev. Applied 4, 034002 (2015).Generating and verifying entangled itinerant microwave fields with efficient and independent measurements
H.S. Ku, W.F. Kindel, F. Mallet, S. Glancy, K.D. Irwin, G.C. Hilton, L.R. Vale, K.W. Lehnert, Phys. Rev. A 91, 042305 (2015).Quantum-enabled temporal and spectral mode conversion of microwave signals
R.W. Andrews, A.P. Reed, K. Cicak, J.D. Teufel, K.W. Lehnert, Nature Communications 6, (2015).DOI: 10.1038/ncomms10021
Connecting microwave and optical frequencies with a vibrational degree of freedom
R.W. Andrews, R.W. Peterson, T.P. Purdy, K. Cicak, R.W. Simmonds, C.A. Regal, K.W. Lehnert, SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII 9343, 934309 (2015).DOI: 10.1117/12.2082941
2014
Future directions in the microwave cavity search for dark matter axions
T.M. Shokair, J. Root, K.A. van Bibber, B. Brubaker, Y.V. Gurevich, S.B. Cahn, S.K. Lamoreaux, M.A. Anil, K.W. Lehnert, B.K. Mitchell, A. Reed, G. Carosi, International Journal of Modern Physics A 29, 1443004 (2014).Measuring a Topological Transition in an Artificial Spin-1/2 System
D. Schroer, H. Kolodrubetz, F. Kindel, M. Sandberg, J. Gao, R. Vissers, P. Pappas, A. Polkovnikov, K.W. Lehnert, Physical Review Letters 113, 050402 (2014).
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Bidirectional and efficient conversion between microwave and optical light
R.W. Andrews, R.W. Peterson, T.P. Purdy, K. Cicak, R.W. Simmonds, C.A. Regal, K.W. Lehnert, Nature Physics 10, 321–326 (2014).DOI: 10.1038/nphys2911
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2013
Entangling Mechanical Motion with Microwave Fields
T.A. Palomaki, J.D. Teufel, R.W. Simmonds, K.W. Lehnert, Science 342, 710-713 (2013).
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Deterministic entanglement of superconducting qubits by parity measurement and feedback
D. Ristè, M. Dukalski, C.A. Watson, G. de Lange, M.J. Tiggelman, Y.M. Blanter, K.W. Lehnert, R.N. Schouten, L. DiCarlo, Nature 502, 350 - 354 (2013).DOI: 10.1038/nature12513
Analysis of single-photon and linear amplifier detectors for microwave cavity dark matter axion searches
S.K. Lamoreaux, K.A. van Bibber, K.W. Lehnert, G. Carosi, Physical Review D 88, 035020 (2013).Tunable Coupling to a Mechanical Oscillator Circuit Using a Coherent Feedback Network
J. Kerckhoff, R.W. Anderson, H.S. Ku, W.F. Kindel, K. Cicak, R.W. Simmonds, K.W. Lehnert, Physical Review X 3, 021013 (2013).Millisecond charge-parity fluctuations and induced decoherence in a superconducting transmon qubit
D. Ristè, C.C. Bultink, M.J. Tiggelman, R.N. Schouten, K.W. Lehnert, L. DiCarlo, Nature Communications 4, 1913 (2013).DOI: 10.1038/ncomms2936
Mechanical resonators for storage and transfer of electrical and optical quantum states
S.A. McGee, D. Meiser, C.A. Regal, K.W. Lehnert, M.J. Holland, Physical Review A 87, 053818 (2013).Coherent state transfer between itinerant microwave fields and a mechanical oscillator
T.A. Palomaki, J.W. Harlow, J.D. Teufel, R.W. Simmonds, K.W. Lehnert, Nature 495, 210 - 214 (2013).DOI: 10.1038/nature11915
2012
Feedback Control of a Solid-State Qubit Using High-Fidelity Projective Measurement
D. Ristè, C.C. Bultink, K.W. Lehnert, L. DiCarlo, Physical Review Letters 109, 240502 (2012).Superconducting Microwave Multivibrator Produced by Coherent Feedback
J. Kerckhoff, K.W. Lehnert, Physical Review Letters 109, 153602 (2012).Initialization by Measurement of a Superconducting Quantum Bit Circuit
D. Ristè, J. van Leeuwen, H.S. Ku, K.W. Lehnert, L. DiCarlo, Physical Review Letters 109, 050507 (2012).Flux-Ramp Modulation for SQUID Multiplexing
J.A.B. Mates, K.D. Irwin, L.R. Vale, G.C. Hilton, J. Gao, K.W. Lehnert, Journal of Low Temperature Physics 167, 707-712 (2012).2011
Sideband cooling of micromechanical motion to the quantum ground state
J.D. Teufel, T. Donner, D. Li, J.W. Harlow, M.S. Allman, K. Cicak, A.J. Sirois, J.D. Whittaker, K.W. Lehnert, R.W. Simmonds, Nature 475, 359–363 (2011).DOI: 10.1038/nature10261
Quantum State Tomography of an Itinerant Squeezed Microwave Field
F. Mallet, M.A. Castellanos-Beltran, H.S. Ku, S. Glancy, E. Knill, K.D. Irwin, G.C. Hilton, L.R. Vale, K.W. Lehnert, Physical Review Letters 106, 220502 (2011).Design and Testing of Superconducting Microwave Passive Components for Quantum Information Processing
H.S. Ku, F. Mallet, L.R. Vale, K.D. Irwin, S.E. Russek, G.C. Hilton, K.W. Lehnert, IEEE Transactions on Applied Superconductivity 21, 452 - 455 (2011).From cavity electromechanics to cavity optomechanics
C.A. Regal, K.W. Lehnert, Journal of Physics: Conference Series 264, 012025 (2011).Non-contact and all-electrical method for monitoring the motion of semiconducting nanowires
S.W. Hoch, J.R. Montague, V.M. Bright, C.T. Rogers, K.A. Bertness, J.D. Teufel, K.W. Lehnert, Applied Physics Letters 99, 053101 (2011).DOI: 10.1063/1.3614562
Strongly quadrature-dependent noise in superconducting microresonators measured at the vacuum-noise limit
J. Gao, L.R. Vale, J.A.B. Mates, D.R. Schmidt, G.C. Hilton, K.D. Irwin, F. Mallet, M.A. Castellanos-Beltran, K.W. Lehnert, J. Zmuidzinas, H.G. Leduc, Applied Physics Letters 98, 232508 (2011).DOI: 10.1063/1.3597156
2009
Nanomechanical motion measured with an imprecision below that at the standard quantum limit
J.D. Teufel, T. Donner, M.A. Castellanos-Beltran, J.W. Harlow, K.W. Lehnert, Nature Nanotechnology 4, 820 - 823 (2009).Bandwidth and Dynamic Range of a Widely Tunable Josephson Parametric Amplifier
M.A. Castellanos-Beltran, K.D. Irwin, L.R. Vale, G.C. Hilton, K.W. Lehnert, IEEE Transactions on Applied Superconductivity 19, 944–947 (2009).2008
Measuring nanomechanical motion with a microwave cavity interferometer
C.A. Regal, J.D. Teufel, K.W. Lehnert, Nature Physics 4, 555 - 560 (2008).DOI: 10.1038/nphys974
Demonstration of a multiplexer of dissipationless superconducting quantum interference devices
J.A.B. Mates, G.C. Hilton, K.D. Irwin, L.R. Vale, K.W. Lehnert, Applied Physics Letters 92, 023514 (2008).DOI: 10.1063/1.2803852
Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
M.A. Castellanos-Beltran, K.D. Irwin, G.C. Hilton, L.R. Vale, K.W. Lehnert, Nature Physics 4, 929 - 931 (2008).DOI: 10.1038/nphys1090
Dynamical Backaction of Microwave Fields on a Nanomechanical Oscillator
J.D. Teufel, J.W. Harlow, C.A. Regal, K.W. Lehnert, Physical Review Letters 101, (2008).
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Prospects for cooling nanomechanical motion by coupling to a superconducting microwave resonator
J.D. Teufel, C.A. Regal, K.W. Lehnert, New Journal of Physics 10, 095002 (2008).2007
Intrinsic Noise Properties of Atomic Point Contact Displacement Detectors
N.E. Flowers-Jacobs, D. Schmidt, K.W. Lehnert, Physical Review Letters 98, (2007).Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator
M.A. Castellanos-Beltran, K.W. Lehnert, Applied Physics Letters 91, 083509 (2007).DOI: 10.1063/1.2773988
Evaluation of a Microwave SQUID Multiplexer Prototype
K.W. Lehnert, K.D. Irwin, M.A. Castellanos-Beltran, J.A.B. Mates, L.R. Vale, IEEE Transactions on Applied Superconductivity 17, 705 - 709 (2007).2006
Normal metal–insulator–superconductor junction technology for bolometers
D.R. Schmidt, W.D. Duncan, K.D. Irwin, K.W. Lehnert, N.A. Miller, J.N. Ullom, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 559, 516 - 518 (2006).Microwave SQUID multiplexers for low-temperature detectors
K.D. Irwin, J.A. Beall, W.B. Doriese, W.D. Duncan, G.C. Hilton, J.A.B. Mates, C.D. Reintsema, D.R. Schmidt, J.N. Ullom, L.R. Vale, B.L. Zink, K.W. Lehnert, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 559, 802 - 804 (2006).2005
Single-electron transistor backaction on the single-electron box
B. Turek, K.W. Lehnert, A.A. Clerk, D. Gunnarsson, K. Bladh, P. Delsing, R.J. Schoelkopf, Physical Review B 71, (2005).A superconductor–insulator–normal metal bolometer with microwave readout suitable for large-format arrays
D.R. Schmidt, K.W. Lehnert, A.M. Clark, W.D. Duncan, K.D. Irwin, N. Miller, J.N. Ullom, Applied Physics Letters 86, 053505 (2005).DOI: 10.1063/1.1855411
2004
Noise performance of the radio-frequency single-electron transistor
L. Roschier, P. Hakonen, K. Bladh, P. Delsing, K.W. Lehnert, L. Spietz, R.J. Schoelkopf, Journal of Applied Physics 95, 1274 (2004).DOI: 10.1063/1.1635972
Microwave SQUID multiplexer
K.D. Irwin, K.W. Lehnert, Applied Physics Letters 85, 2107 (2004).DOI: 10.1063/1.1791733
Noise performance of the radio-frequency single-electron transistor
R.J. Schoelkopf, L. Spietz, K.W. Lehnert, L. Roschier, P. Hakonen, K. Bladh, P. Delsing, Journal of Applied Physics 95, 1274 (2004).DOI: 10.1063/1.1635972
2003
Measurement of the Excited-State Lifetime of a Microelectronic Circuit
K.W. Lehnert, K. Bladh, L. Spietz, D. Gunnarsson, D. Schuster, P. Delsing, R.J. Schoelkopf, Physical Review Letters 90, (2003).Quantum Charge Fluctuations and the Polarizability of the Single-Electron Box
K.W. Lehnert, B. Turek, K. Bladh, L. Spietz, D. Gunnarsson, P. Delsing, R.J. Schoelkopf, Physical Review Letters 91, (2003).Measurement of the Excited-State Lifetime of a Microelectronic Circuit
K.W. Lehnert, K. Bladh, L. Spietz, D. Gunnarsson, D. Schuster, P. Delsing, R.J. Schoelkopf, Physical Review Letters 90, (2003).Primary Electronic Thermometry Using the Shot Noise of a Tunnel Junction
L. Spietz, K.W. Lehnert, I. Siddiqi, R.J. Schoelkopf, Science 300, 1929 - 1932 (2003).Noise and measurement backaction in superconducting circuits: qubits as spectrometers of quantum noise
R.J. Schoelkopf, A.A. Clerk, S.M. Girvin, K.W. Lehnert, M.H. Devoret, SPIE Proceedings: First International Symposium on Fluctuations and Noise and Information in Nanoelectronics, Sensors, and Standards, (2003).DOI: 10.1117/12.488922
2002
Density-dependent critical currents in quantum-well-coupled weak links
T.A. Eckhause, K.W. Lehnert, J.S. Correa, R.J. Jorstad, E.G. Gwinn, M. Thomas, Applied Physics Letters 81, 3203 (2002).DOI: 10.1063/1.1517174
A high-performance cryogenic amplifier based on a radio-frequency single electron transistor
K. Segall, K.W. Lehnert, T.R. Stevenson, R.J. Schoelkopf, P. Wahlgren, A. Aassime, P. Delsing, Applied Physics Letters 81, 4859 (2002).DOI: 10.1063/1.1530751