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Non-classical energy squeezing of a macroscopic mechanical oscillator

X. Ma, J.J. Viennot, S. Kotler, J.D. Teufel, K.W. Lehnert, Nature Physics, (2021).
Publication Highlights


Improved analysis framework for axion dark matter searches

D.A. Palken, B.M. Brubaker, M. Malnou, A. Kenany, K.M. Backes, S.B. Cahn, Y.V. Gurevich, S.K. Lamoreaux, S.M. Lewis, R.H. Maruyama, N.M. Rapidis, J.R. Root, M. Simanovskaia, T.M. Shokair, S. Singh, D.H. Speller, I. Urdinaran, K. van Bibber, L. Zhong, K.W. Lehnert, Phys. Rev. D 101, 123011 (2020).

Hybrid quantum systems with circuit quantum electrodynamics

A.A. Clerk, K.W. Lehnert, P. Bertet, J.R. Petta, Y. Nakamura, Nature Physics 16, 257–267 (2020).


Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit Qubit

L.R. Sletten, B.A. Moores, J.J. Viennot, K.W. Lehnert, Phys. Rev. X 9, 021056 (2019).
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Highlighted in Physics

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).

Measurement of Motion beyond the Quantum Limit by Transient Amplification

R.D. Delaney, A.P. Reed, R.W. Andrews, K.W. Lehnert, Phys. Rev. Lett. 123, 183603 (2019).
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Putting the squeeze on axions

K. van Bibber, K. Lehnert, A. Chou, Physics Today 72, 48 (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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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).

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 14, 1038–1042 (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

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).

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).

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).


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).
Publication Highlights

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).
Publication Highlights

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).

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).

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).

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).


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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Proposal to Test Bell's Inequality in Electromechanics

S.G. Hofer, K.W. Lehnert, K. Hammerer, Phys. Rev. Lett. 116, 070406 (2016).

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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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).

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).


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).

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).


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).
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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).

Entangling Mechanical Motion with Microwave Fields

T.A. Palomaki, J.D. Teufel, R.W. Simmonds, K.W. Lehnert, Science 342, 710-713 (2013).
Publication Highlights

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).

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).


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).


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).

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).

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).

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).


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).


Measuring nanomechanical motion with a microwave cavity interferometer

C.A. Regal, J.D. Teufel, K.W. Lehnert, Nature Physics 4, 555 - 560 (2008).

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).

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).

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).


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).

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).


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).

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).


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).


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).

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).

Microwave SQUID multiplexer

K.D. Irwin, K.W. Lehnert, Applied Physics Letters 85, 2107 (2004).


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).


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).

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).