Publications (35)
Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions
Martin W. Zwierlein, Zoran Hadzibabic, Subhadeep Gupta +1
We have experimentally demonstrated the absence of spectroscopic resonance shifts in a mixture of two interacting Fermi gases. This result is linked to observations in an ultracold…
Quantum micro-mechanics with ultracold atoms
Thierry Botter, Daniel Brooks, Subhadeep Gupta +5
In many experiments isolated atoms and ions have been inserted into high-finesse optical resonators for the study of fundamental quantum optics and quantum information. Here, we in…
Cavity Nonlinear Optics at Low Photon Numbers from Collective Atomic Motion
Subhadeep Gupta, Kevin L. Moore, Kater W. Murch +1
We report on Kerr nonlinearity and dispersive optical bistability of a Fabry-Perot optical resonator due to the displacement of ultracold atoms trapped within. In the driven resona…
Neutral Atoms in Optical Tweezers as Messenger Qubits for Scaling up a Trapped Ion Quantum Computer
Svetlana Kotochigova, Subhadeep Gupta, Boris Blinov
We propose to combine neutral atom and trapped ion qubits in one scalable modular architecture that uses shuttling of individual neutral atoms in optical tweezers to realize atomic…
Decoding active force fluctuations from spatial trajectories of active systems
Anisha Majhi, Biswajit Das, Subhadeep Gupta +4
Mesoscopic active systems exhibit various unique behaviours - absent in passive systems - due to the forces generated by the corresponding constituents by converting their availabl…
Many-Body Anderson Metal-Insulator Transition using Kicked Quantum Gases
Jun Hui See Toh, Mengxin Du, Xinxin Tang +6
Understanding the interplay of interactions and disorder in quantum transport poses long-standing scientific challenges, with many-body quantum transport phenomena in high-dimensio…
Crossed-Beam slowing to enhance narrow-line Ytterbium Magneto-Optic Traps
Benjamin Plotkin-Swing, Anna Wirth, Daniel Gochnauer +3
We demonstrate a method to enhance the atom loading rate of a ytterbium (Yb) magneto-optic trap (MOT) operating on the 556 nm intercombination transit…
Feshbach resonances in -wave three-body recombination within Fermi-Fermi mixtures of open-shell Li and closed-shell Yb atoms
Alaina Green, Hui Li, Jun Hui See Toh +6
We report on observations and modeling of interspecies magnetic Feshbach resonances in dilute ultracold mixtures of open-shell alkali-metal Li and closed-shell Yb atoms…
Photoassociative production of ultracold heteronuclear YbLi* molecules
Richard Roy, Rajendra Shrestha, Alaina Green +5
We report on the production of ultracold heteronuclear YbLi* molecules in a dual-species magneto-optical trap by photoassociation (PA). The formation of the electronically excited…
Sympathetic cooling in an optically trapped mixture of alkali and spin-singlet atoms
Vladyslav V. Ivanov, Alexander Khramov, Anders H. Hansen +4
We report on the realization of a stable mixture of ultracold lithium and ytterbium atoms confined in a far-off-resonance optical dipole trap. We observe sympathetic cooling of 6Li…
Bose-Einstein condensation in a mm-scale Ioffe-Pritchard trap
Kevin L. Moore, Thomas P. Purdy, Kater W. Murch +4
We have constructed a mm-scale Ioffe-Pritchard trap capable of providing axial field curvature of 7800 G/cm with only 10.5 Amperes of driving current. Our novel fabrication met…
Magnetic field dependent interactions in an ultracold Li-Yb(P) mixture
William Dowd, Richard J. Roy, Rajendra K. Shrestha +4
Magnetic Feshbach resonances have allowed great success in the production of ultracold diatomic molecules from bi-alkali mixtures, but have so far eluded observation in mixtures of…
Rapid Cooling to Quantum Degeneracy in Dynamically Shaped Atom Traps
Richard Roy, Alaina Green, Ryan Bowler +1
We report on a general method for the rapid production of quantum degenerate gases. Using 174Yb, we achieve an experimental cycle time as low as (1.6-1.8) s for the production of B…
Interferometry in an Atomic Fountain with Ytterbium Bose-Einstein Condensates
Daniel Gochnauer, Tahiyat Rahman, Anna Wirth-Singh +1
We present enabling experimental tools and atom interferometer implementations in a vertical "fountain" geometry with ytterbium Bose-Einstein condensates. To meet the unique challe…
Laser-driven Sisyphus cooling in an optical dipole trap
Vladyslav V. Ivanov, Subhadeep Gupta
We propose a novel Sisyphus cooling scheme for atoms confined in a far off resonance optical dipole trap. Utilizing the differential trap-induced AC Stark shift, two electronic lev…
Bloch Oscillation Phases investigated by Multi-path Stuckelberg Atom Interferometry
Tahiyat Rahman, Anna Wirth-Singh, Andrew Ivanov +3
Atoms undergoing Bloch oscillations (BOs) in an accelerating optical lattice acquire momentum of two photon recoils per BO. This technique provides a large momentum transfer tool f…
Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
Adam Abdalla, Mahiro Abe, Sven Abend +307
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, build…
Bloch-bands Picture for Light Pulse Atom Diffraction and Interferometry
Daniel Gochnauer, Katherine E. McAlpine, Benjamin Plotkin-Swing +2
We apply a Bloch-bands approach to the analysis of pulsed optical standing wave diffractive elements in optics and interferometry with ultracold atoms. We verify our method by comp…
Collisions in zero temperature Fermi gases
Subhadeep Gupta, Zoran Hadzibabic, James R. Anglin +1
We examine the collisional behavior of two-component Fermi gases released at zero temperature from a harmonic trap. Using a phase-space formalism to calculate the collision rate du…
Observation of quantum-measurement backaction with an ultracold atomic gas
Kater W. Murch, Kevin L. Moore, Subhadeep Gupta +1
Current research on micro-mechanical resonators strives for quantum-limited detection of the motion of macroscopic objects. Prerequisite to this goal is the observation of measurem…
Observation of Many-body Dynamical Delocalization in a Kicked Ultracold Gas
Jun Hui See Toh, Katherine C. McCormick, Xinxin Tang +4
Contrary to a driven classical system that exhibits chaos phenomena and diffusive energy growth, a driven quantum system can exhibit dynamical localization that features energy sat…
Probing the quantum state of a guided atom laser pulse
Kevin L. Moore, Subhadeep Gupta, Kater W. Murch +1
We describe bichromatic superradiant pump-probe spectroscopy as a tomographic probe of the Wigner function of a dispersing particle beam. We employed this technique to characterize…
Production of quantum degenerate mixtures of ytterbium and lithium with controllable inter-species overlap
Anders H. Hansen, Alexander Y. Khramov, William H. Dowd +4
Quantum degenerate mixtures of alkali and spin-singlet atoms form the starting point for studying few- and many-body physics of mass-imbalanced pairs as well as the production of p…
Atomic Interactions in Precision Interferometry Using Bose-Einstein Condensates
Alan O. Jamison, J. Nathan Kutz, Subhadeep Gupta
We present theoretical tools for predicting and reducing the effects of atomic interactions in Bose-Einstein condensate (BEC) interferometry experiments. To address mean-field shif…
Two-Element Mixture of Bose and Fermi Superfluids
Richard Roy, Alaina Green, Ryan Bowler +1
We report on the production of a stable mixture of bosonic and fermionic superfluids composed of the elements Yb and Li which feature a strong mismatch in mass and dist…
Detecting Entrainment in Fermi-Bose Mixtures
Khalid Hossain, Subhadeep Gupta, Michael McNeil Forbes
We propose an experimental protocol to directly detect the Andreev-Bashkin effect (entrainment) in the bulk mixture of a bosonic and fermionic superfluid using a ring geometry. Our…
Ultracold Heteronuclear Mixture of Ground and Excited State Atoms
Alexander Khramov, Anders Hansen, William Dowd +5
We report on the realization of an ultracold mixture of lithium atoms in the ground state and ytterbium atoms in the excited metastable 3P2 state. Such a mixture can support broad…
Advances in precision contrast interferometry with Yb Bose-Einstein condensates
Alan O. Jamison, Benjamin Plotkin-Swing, Subhadeep Gupta
Using a three-path contrast interferometer (CI) geometry and laser-pulse diffraction gratings, we create the first matter-wave interferometer with ytterbium (Yb) atoms. We present…
Lattice-Trapped Atom Interferometry with a Bose-Einstein condensate: Observation and Control of Interactions
Emmett Hough, Tahiyat Rahman, Forest Tschirhart +1
Precision interferometry with atomic wavepackets confined in a one-dimensional optical lattice is an emergent paradigm in quantum sensing of forces and fields, with applications in…
Excited-Band Bloch Oscillations for Precision Atom Interferometry
Katherine E. McAlpine, Daniel Gochnauer, Subhadeep Gupta
We propose and demonstrate a method to increase the momentum separation between the arms of an atom interferometer and thus its area and measurement precision, by using Bloch oscil…
Two-photon photoassociation spectroscopy of the YbLi molecular ground state
Alaina Green, Jun Hui See Toh, Richard Roy +3
We report on measurements of the binding energies of several weakly bound vibrational states of the paramagnetic YbLi molecule in the electronic ground state using tw…
Active Stabilization of a Diode Laser Injection Lock
Brendan Saxberg, Benjamin Plotkin-Swing, Subhadeep Gupta
We report on a device to electronically stabilize the optical injection lock of a semiconductor diode laser. Our technique uses as discriminator the peak height of the laser's tran…
Quantum Degenerate Mixture of Ytterbium and Lithium Atoms
Anders H. Hansen, Alexander Khramov, William H. Dowd +3
We have produced a quantum degenerate mixture of fermionic alkali 6Li and bosonic spin-singlet 174Yb gases. This was achieved using sympathetic cooling of lithium atoms by evaporat…
Collimated, single-pass atom source from a pulsed alkali metal dispenser for laser-cooling experiments
Kevin L. Moore, Thomas P. Purdy, Kater W. Murch +3
We have developed an improved scheme for loading atoms into a magneto-optical trap (MOT) from a directed alkali metal dispenser in < 10^-10 torr ultra-high vacuum conditions. A cur…
Three-path atom interferometry with large momentum separation
Benjamin Plotkin-Swing, Daniel Gochnauer, Katherine E. McAlpine +3
We demonstrate the scale up of a symmetric three-path contrast interferometer to large momentum separation. The observed phase stability at separation of 112 photon recoil momenta…