Publications (98)
Probing many-body localization on a noisy quantum computer
D. Zhu, S. Johri, N. H. Nguyen +5
A disordered system of interacting particles exhibits localized behavior when the disorder is large compared to the interaction strength. Studying this phenomenon on a quantum comp…
Efficient Photoionization-Loading of Trapped Cadmium Ions with Ultrafast Pulses
L. Deslauriers, M. Acton, B. B. Blinov +16
Atomic cadmium ions are loaded into radiofrequency ion traps by photoionization of atoms in a cadmium vapor with ultrafast laser pulses. The photoionization is driven through an in…
Demonstration of a small programmable quantum computer with atomic qubits
S. Debnath, N. M. Linke, C. Figgatt +3
Quantum computers can solve certain problems more efficiently than any possible conventional computer. Small quantum algorithms have been demonstrated on multiple quantum computing…
Experimental Realization of a Quantum Integer-Spin Chain with Controllable Interactions
C. Senko, P. Richerme, J. Smith +4
The physics of interacting integer-spin chains has been a topic of intense theoretical interest, particularly in the context of symmetry-protected topological phases. However, ther…
Coherent Error Suppression in Multi-Qubit Entangling Gates
D. Hayes, S. M. Clark, S. Debnath +5
We demonstrate a simple pulse shaping technique designed to improve the fidelity of spin-dependent force operations commonly used to implement entangling gates in trapped-ion syste…
Atomic Qubit Manipulations with an Electro-Optic Modulator
P. J. Lee, B. B. Blinov, K. Brickman +6
We report new techniques for driving high-fidelity stimulated Raman transitions in trapped ion qubits. An electro-optic modulator induces sidebands on an optical source, and interf…
Precision lifetime measurements of a single trapped ion with ultrafast laser pulses
D. L. Moehring, B. B. Blinov, D. W. Gidley +5
We report precision measurements of the excited state lifetime of the and levels of a single trapped Cd ion. The ion is excited with picosecon…
T-junction ion trap array for two-dimensional ion shuttling, storage and manipulation
W. K. Hensinger, S. Olmschenk, D. Stick +6
We demonstrate a two-dimensional 11-zone ion trap array, where individual laser-cooled atomic ions are stored, separated, shuttled, and swapped. The trap geometry consists of two l…
Onset of a Quantum Phase Transition with a Trapped Ion Quantum Simulator
R. Islam, E. E. Edwards, K. Kim +8
A quantum simulator is a well controlled quantum system that can simulate the behavior of another quantum system which may require exponentially large classical computing resources…
Observation of Stark many-body localization without disorder
W. Morong, F. Liu, P. Becker +7
Thermalization is a ubiquitous process of statistical physics, in which details of few-body observables are washed out in favor of a featureless steady state. Even in isolated quan…
Observation of a Many-Body Dynamical Phase Transition with a 53-Qubit Quantum Simulator
J. Zhang, G. Pagano, P. W. Hess +6
A quantum simulator is a restricted class of quantum computer that controls the interactions between quantum bits in a way that can be mapped to certain difficult quantum many-body…
Quantum Simulation and Phase Diagram of the Transverse Field Ising Model with Three Atomic Spins
E. E. Edwards, S. Korenblit, K. Kim +6
We perform a quantum simulation of the Ising model with a transverse field using a collection of three trapped atomic ion spins. By adiabatically manipulating the Hamiltonian, we d…
Experimental issues in coherent quantum-state manipulation of trapped atomic ions
D. J. Wineland, C. Monroe, W. M. Itano +3
Methods for, and limitations to, the generation of entangled states of trapped atomic ions are examined. As much as possible, state manipulations are described in terms of quantum…
Random Numbers Certified by Bell's Theorem
S. Pironio, A. Acin, S. Massar +8
Randomness is a fundamental feature in nature and a valuable resource for applications ranging from cryptography and gambling to numerical simulation of physical and biological sys…
Emergence and Frustration of Magnetic Order with Variable-Range Interactions in a Trapped Ion Quantum Simulator
R. Islam, C. Senko, W. C. Campbell +7
Frustration, or the competition between interacting components of a network, is often responsible for the complexity of many body systems, from social and neural networks to protei…
Quantum Logic Using Sympathetically Cooled Ions
D. Kielpinski, B. E. King, C. J. Myatt +6
One limit to the fidelity of quantum logic operations on trapped ions arises from heating of the ions' collective modes of motion. Sympathetic cooling of the ions during the logic…
Engineering dynamically decoupled quantum simulations with trapped ions
W. Morong, K. S. Collins, A. De +3
An external drive can improve the coherence of a quantum many-body system by averaging out noise sources. It can also be used to realize models that are inaccessible in the static…
Demonstration of two-atom entanglement with ultrafast optical pulses
J. D. Wong-Campos, S. A. Moses, K. G. Johnson +1
We demonstrate quantum entanglement of two trapped atomic ion qubits using a sequence of ultrafast laser pulses. Unlike previous demonstrations of entanglement mediated by the Coul…
Entanglement and Tunable Spin-Spin Couplings Between Trapped Ions Using Multiple Transverse Modes
K. Kim, M. -S. Chang, R. Islam +3
We demonstrate tunable spin-spin couplings between trapped atomic ions, mediated by laser forces on multiple transverse collective modes of motion. A -type Ising interac…
On the Transport of Atomic Ions in Linear and Multidimensional Ion Trap Arrays
D. Hucul, M. Yeo, W. K. Hensinger +3
Trapped atomic ions have become one of the most promising architectures for a quantum computer, and current effort is now devoted to the transport of trapped ions through complex s…
Quantum Gates on Individually-Addressed Atomic Qubits Subject to Noisy Transverse Motion
M. Cetina, L. N. Egan, C. A. Noel +5
Individual trapped atomic qubits represent one of the most promising technologies to scale quantum computers, owing to their negligible idle errors and the ability to implement a f…
Coherent Imaging Spectroscopy of a Quantum Many-Body Spin System
C. Senko, J. Smith, P. Richerme +3
Quantum simulators, in which well controlled quantum systems are used to reproduce the dynamics of less understood ones, have the potential to explore physics that is inaccessible…
Recent Results in Trapped-Ion Quantum Computing
D. Kielpinski, A. Ben-Kish, J. Britton +6
We review recent experiments on entanglement, Bell's inequality, and decoherence-free subspaces in a quantum register of trapped \be ions. We have demonstrated entanglement of up t…
Observation of Hopping and Blockade of Bosons in a Trapped Ion Spin Chain
S. Debnath, N. M. Linke, S. -T. Wang +4
The local phonon modes in a Coulomb crystal of trapped ions can represent a Hubbard system of coupled bosons. We selectively prepare single excitations at each site and observe fre…
Magneto-optical Trapping of Cadmium
K. -A. Brickman, M. -S. Chang, M. Acton +5
We report the laser-cooling and confinement of Cd atoms in a magneto-optical trap, and characterize the loading process from the background Cd vapor. The trapping laser drives the…
Probabilistic Quantum Gates between Remote Atoms through Interference of Optical Frequency Qubits
L. -M. Duan, M. J. Madsen, D. L. Moehring +3
We propose a scheme to perform probabilistic quantum gates on remote trapped atom qubits through interference of optical frequency qubits. The method does not require localization…
Experimental Bell Inequality Violation with an Atom and a Photon
D. L. Moehring, M. J. Madsen, B. B. Blinov +1
We report the measurement of a Bell inequality violation with a single atom and a single photon prepared in a probabilistic entangled state. This is the first demonstration of such…
Noise reduction using past causal cones in variational quantum algorithms
Omar Shehab, Isaac H. Kim, Nhung H. Nguyen +5
We introduce an approach to improve the accuracy and reduce the sample complexity of near term quantum-classical algorithms. We construct a simpler initial parameterized quantum st…
Bell inequality violation with two remote atomic qubits
D. N. Matsukevich, P. Maunz, D. L. Moehring +2
We observe violation of a Bell inequality between the quantum states of two remote Yb ions separated by a distance of about one meter with the detection loophole closed. The herald…
Modular Entanglement of Atomic Qubits using both Photons and Phonons
D. Hucul, I. V. Inlek, G. Vittorini +4
Quantum entanglement is the central resource behind applications in quantum information science, from quantum computers and simulators of complex quantum systems to metrology and s…
Control of trapped-ion quantum states with optical pulses
C. Rangan, A. M. Bloch, C. Monroe +1
We present new results on the quantum control of systems with infinitely large Hilbert spaces. A control-theoretic analysis of the control of trapped ion quantum states via optical…
Demonstration of a scalable, multiplexed ion trap for quantum information processing
D. R. Leibrandt, J. Labaziewicz, R. J. Clark +14
A scalable, multiplexed ion trap for quantum information processing is fabricated and tested. The trap design and fabrication process are optimized for scalability to small trap si…
Beat note stabilization of mode-locked lasers for quantum information processing
R. Islam, W. C. Campbell, T. Choi +18
We stabilize a chosen radiofrequency beat note between two optical fields derived from the same mode-locked laser pulse train, in order to coherently manipulate quantum information…
Training of Quantum Circuits on a Hybrid Quantum Computer
D. Zhu, N. M. Linke, M. Benedetti +10
Generative modeling is a flavor of machine learning with applications ranging from computer vision to chemical design. It is expected to be one of the techniques most suited to tak…
Ultrafast Gates for Single Atomic Qubits
W. C. Campbell, J. Mizrahi, Q. Quraishi +6
We demonstrate single qubit operations on a trapped atom hyperfine qubit using a single ultrafast pulse from a mode-locked laser. We shape the pulse from the laser and perform a pi…
Scaling and Suppression of Anomalous Quantum Decoherence in Ion Traps
L. Deslauriers, S. Olmschenk, D. Stick +3
We measure and characterize anomalous motional decoherence of an atomic ion confined in the lowest quantum levels of a novel rf ion trap that features moveable electrodes. The scal…
Quantum Approximate Optimization of the Long-Range Ising Model with a Trapped-Ion Quantum Simulator
G. Pagano, A. Bapat, P. Becker +13
Quantum computers and simulators may offer significant advantages over their classical counterparts, providing insights into quantum many-body systems and possibly improving perfor…
Non-thermalization in trapped atomic ion spin chains
P. W. Hess, P. Becker, H. B. Kaplan +10
Linear arrays of trapped and laser cooled atomic ions are a versatile platform for studying emergent phenomena in strongly-interacting many-body systems. Effective spins are encode…
Quantum Logic Between Distant Trapped Ions
S. Olmschenk, D. Hayes, D. N. Matsukevich +3
Trapped atomic ions have proven to be one of the most promising candidates for the realization of quantum computation due to their long trapping times, excellent coherence properti…
Deterministic entanglement of two trapped ions
Q. A. Turchette, C. S. Wood, B. E. King +5
We have prepared the internal states of two trapped ions in both the Bell-like singlet and triplet entangled states. In contrast to all other experiments with entangled states of e…
Large Scale Quantum Computation in an Anharmonic Linear Ion Trap
G. -D. Lin, S. -L. Zhu, R. Islam +5
We propose a large-scale quantum computer architecture by stabilizing a single large linear ion chain in a very simple trap geometry. By confining ions in an anharmonic linear trap…
Cryogenic Trapped-Ion System for Large Scale Quantum Simulation
G. Pagano, P. W. Hess, H. B. Kaplan +9
We present a cryogenic ion trapping system designed for large scale quantum simulation of spin models. Our apparatus is based on a segmented-blade ion trap enclosed in a 4 K cryost…
Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger's Cat
D. J. Wineland, C. Monroe, W. M. Itano +5
We summarize efforts at NIST to implement quantum computation using trapped ions, based on a scheme proposed by J.I. Cirac and P. Zoller (Innsbruck University). The use of quantum…
Entanglement of distinguishable quantum memories
G. Vittorini, D. Hucul, I. V. Inlek +2
Time-resolved photon detection can be used to generate entanglement between distinguishable photons. This technique can be extended to entangle quantum memories that emit photons w…
Ultrafast Coherent Coupling of Atomic Hyperfine and Photon Frequency Qubits
M. J. Madsen, D. L. Moehring, P. Maunz +3
We demonstrate ultrafast coherent coupling between an atomic qubit stored in a single trapped cadmium ion and a photonic qubit represented by two resolved frequencies of a photon.…
Quantum harmonic oscillator state synthesis and analysis
W. M. Itano, C. Monroe, D. M. Meekhof +3
Experiments are described in which a single, harmonically bound, beryllium ion in a Paul trap is put into Fock, thermal, coherent, squeezed, and Schroedinger cat states. Experiment…
Large Scale Modular Quantum Computer Architecture with Atomic Memory and Photonic Interconnects
C. Monroe, R. Raussendorf, A. Ruthven +4
The practical construction of scalable quantum computer hardware capable of executing non-trivial quantum algorithms will require the juxtaposition of different types of quantum sy…
Comparison of Cloud-Based Ion Trap and Superconducting Quantum Computer Architectures
S. Blinov, B. Wu, C. Monroe
Quantum computing represents a radical departure from conventional approaches to information processing, offering the potential for solving problems that can never be approached cl…
Experimental Comparison of Two Quantum Computing Architectures
N. M. Linke, D. Maslov, M. Roetteler +5
We run a selection of algorithms on two state-of-the-art 5-qubit quantum computers that are based on different technology platforms. One is a publicly accessible superconducting tr…
Generation of Thermofield Double States and Critical Ground States with a Quantum Computer
D. Zhu, S. Johri, N. M. Linke +6
Finite-temperature phases of many-body quantum systems are fundamental to phenomena ranging from condensed-matter physics to cosmology, yet they are generally difficult to simulate…
Programmable Quantum Simulations of Spin Systems with Trapped Ions
C. Monroe, W. C. Campbell, L. -M. Duan +10
Laser-cooled and trapped atomic ions form an ideal standard for the simulation of interacting quantum spin models. Effective spins are represented by appropriate internal energy le…
Precision measurement of the lifetime of the 6p 2P_1/2 level of Yb+
S. Olmschenk, D. Hayes, D. N. Matsukevich +4
We present a precise measurement of the lifetime of the 6p 2P_1/2 excited state of a single trapped ytterbium ion (Yb+). A time-correlated single-photon counting technique is used,…
Quantum Control of Qubits and Atomic Motion Using Ultrafast Laser Pulses
J. Mizrahi, B. Neyenhuis, K. Johnson +4
Pulsed lasers offer significant advantages over CW lasers in the coherent control of qubits. Here we review the theoretical and experimental aspects of controlling the internal and…
Simulating the Haldane Phase in Trapped Ion Spins Using Optical Fields
I. Cohen, P. Richerme, Z. -X. Gong +2
We propose to experimentally explore the Haldane phase in spin-one XXZ antiferromagnetic chains using trapped ions. We show how to adiabatically prepare the ground states of the Ha…
Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
S. Olmschenk, K. C. Younge, D. L. Moehring +3
We demonstrate the use of trapped ytterbium ions as quantum bits for quantum information processing. We implement fast, efficient state preparation and state detection of the first…
Implementation of Grover's Quantum Search Algorithm in a Scalable System
K. -A. Brickman, P. C. Haljan, P. J. Lee +3
We report the implementation of Grover's quantum search algorithm in the scalable system of trapped atomic ion quantum bits. Any one of four possible states of a two-qubit memory i…
High resolution adaptive imaging of a single atom
J. D. Wong-Campos, K. G. Johnson, B. Neyenhuis +2
We report the optical imaging of a single atom with nanometer resolution using an adaptive optical alignment technique that is applicable to general optical microscopy. By decompos…
Zero-Point cooling and low heating of trapped 111Cd+ ions
L. Deslauriers, P. C. Haljan, P. J. Lee +4
We report on ground state laser cooling of single 111Cd+ ions confined in radio-frequency (Paul) traps. Heating rates of trapped ion motion are measured for two different trapping…
Active Stabilization of Ion Trap Radiofrequency Potentials
K. G. Johnson, J. D. Wong-Campos, A. Restelli +4
We actively stabilize the harmonic oscillation frequency of a laser-cooled atomic ion confined in a rf Paul trap by sampling and rectifying the high voltage rf applied to the trap…
Parallel Entangling Operations on a Universal Ion Trap Quantum Computer
C. Figgatt, A. Ostrander, N. M. Linke +4
The circuit model of a quantum computer consists of sequences of gate operations between quantum bits (qubits), drawn from a universal family of discrete operations. The ability to…
Benchmarking an 11-qubit quantum computer
K. Wright, K. M. Beck, S. Debnath +21
The field of quantum computing has grown from concept to demonstration devices over the past 20 years. Universal quantum computing offers efficiency in approaching problems of scie…
Many Body Thermodynamics on Quantum Computers via Partition Function Zeros
Akhil Francis, D. Zhu, C. Huerta Alderete +6
Interacting quantum systems illustrate complex phenomena including phase transitions to novel ordered phases. The universal nature of critical phenomena reduces their description t…
Trapped ion quantum computation with transverse phonon modes
Shi-Liang Zhu, C. Monroe, L. -M. Duan
We propose a scheme to implement quantum gates on any pair of trapped ions immersed in a large linear crystal, using interaction mediated by the transverse phonon modes. Compared w…
Simplified quantum logic with trapped ions
C. Monroe, D. Leibfried, B. E. King +3
We describe a simplified scheme for quantum logic with a collection of laser-cooled trapped atomic ions. Building on the scheme of Cirac and Zoller, we show how the fundamental con…
Cooling the Collective Motion of Trapped Ions to Initialize a Quantum Register
B. E. King, C. S. Wood, C. J. Myatt +5
We report preparation in the ground state of collective modes of motion of two trapped 9Be+ ions. This is a crucial step towards realizing quantum logic gates which can entangle th…
Ion Trap in a Semiconductor Chip
D. Stick, W. K. Hensinger, S. Olmschenk +3
The electromagnetic manipulation of isolated atoms has led to many advances in physics, from laser cooling and Bose-Einstein condensation of cold gases to the precise quantum contr…
Observation of a Discrete Time Crystal
J. Zhang, P. W. Hess, A. Kyprianidis +9
Spontaneous symmetry breaking is a fundamental concept in many areas of physics, ranging from cosmology and particle physics to condensed matter. A prime example is the breaking of…
Quantum state manipulation of trapped atomic ions
D. J. Wineland, C. Monroe, D. M. Meekhof +7
A single laser-cooled and trapped 9Be+ ion is used to investigate methods of coherent quantum-state synthesis and quantum logic. We create and characterize nonclassical states of m…
Observation of Prethermalization in Long-Range Interacting Spin Chains
B. Neyenhuis, J. Smith, A. C. Lee +6
Statistical mechanics can predict thermal equilibrium states for most classical systems, but for an isolated quantum system there is no general understanding on how equilibrium sta…
Ultrafast Creation of Large Schrödinger Cat States of an Atom
K. G. Johnson, J. D. Wong-Campos, B. Neyenhuis +2
Mesoscopic quantum superpositions, or Schrödinger cat states, are widely studied for fundamental investigations of quantum measurement and decoherence as well as applications in s…
A heralded quantum gate between remote quantum memories
P. Maunz, S. Olmschenk, D. Hayes +3
We demonstrate a probabilistic entangling quantum gate between two distant trapped ytterbium ions. The gate is implemented between the hyperfine "clock" state atomic qubits and med…
Complete 3-Qubit Grover Search on a Programmable Quantum Computer
C. Figgatt, D. Maslov, K. A. Landsman +3
Searching large databases is an important problem with broad applications. The Grover search algorithm provides a powerful method for quantum computers to perform searches with a q…
Broadband laser cooling of trapped atoms with ultrafast pulses
B. B. Blinov, R. N. Kohn, M. J. Madsen +3
We demonstrate broadband laser cooling of atomic ions in an rf trap using ultrafast pulses from a modelocked laser. The temperature of a single ion is measured by observing the siz…
Scalable Trapped Ion Quantum Computation with a Probabilistic Ion-Photon Mapping
L. -M. Duan, B. B. Blinov, D. L. Moehring +1
We propose a method for scaling trapped ions for large-scale quantum computation and communication based on a probabilistic ion-photon mapping. Deterministic quantum gates between…
Fault-tolerant quantum error detection
N. M. Linke, M. Gutierrez, K. A. Landsman +4
Quantum computers will eventually reach a size at which quantum error correction becomes imperative. Quantum information can be protected from qubit imperfections and flawed contro…
Multi-Species Trapped Ion Node for Quantum Networking
I. V. Inlek, C. Crocker, M. Lichtman +2
Trapped atomic ions are a leading platform for quantum information networks, with long-lived identical qubit memories that can be locally entangled through their Coulomb interactio…
Ion trap transducers for quantum electromechanical oscillators
W. K. Hensinger, D. W. Utami, H. -S. Goan +3
An enduring challenge for contemporary physics is to experimentally observe and control quantum behavior in macroscopic systems. We show that a single trapped atomic ion could be u…
Sharp phase transitions in a small frustrated network of trapped ion spins
G. -D. Lin, C. Monroe, L. -M. Duan
Sharp quantum phase transitions typically require a large system with many particles. Here we show that for a frustrated fully-connected Ising spin network represented by trapped a…
Heating of trapped ions from the quantum ground state
Q. A. Turchette, D. Kielpinski, B. E. King +9
We have investigated motional heating of laser-cooled 9Be+ ions held in radio-frequency (Paul) traps. We have measured heating rates in a variety of traps with different geometries…
Protocols and Techniques for a Scalable Atom--Photon Quantum Network
L. Luo, D. Hayes, T. A. Manning +5
Quantum networks based on atomic qubits and scattered photons provide a promising way to build a large-scale quantum information processor. We review quantum protocols for generati…
Co-Designing a Scalable Quantum Computer with Trapped Atomic Ions
K. R. Brown, J. Kim, C. Monroe
The first generation of quantum computers are on the horizon, fabricated from quantum hardware platforms that may soon be able to tackle certain tasks that cannot be performed or m…
Photon collection from a trapped ion--cavity system
J. D. Sterk, L. Luo, T. A. Manning +2
We present the design and implementation of a trapped ion cavity QED system. A single ytterbium ion is confined by a micron-scale ion trap inside a 2 mm optical cavity. The ion is…
Quantum Interference of Photon Pairs from Two Trapped Atomic Ions
P. Maunz, D. L. Moehring, M. J. Madsen +3
We collect the fluorescence from two trapped atomic ions, and measure quantum interference between photons emitted from the ions. The interference of two photons is a crucial compo…
Spin-dependent forces on trapped ions for phase-stable quantum gates and motional Schrodinger-cat states
P. C. Haljan, K. -A. Brickman, L. Deslauriers +2
Favored schemes for trapped-ion quantum logic gates use bichromatic laser fields to couple internal qubit states with external motion through a "spin-dependent force." We introduce…
Optimal quantum control of multi-mode couplings between trapped ion qubits for scalable entanglement
T. Choi, S. Debnath, T. A. Manning +4
We demonstrate high fidelity entangling quantum gates within a chain of five trapped ion qubits by optimally shaping optical fields that couple to multiple collective modes of moti…
Entanglement of Atomic Qubits using an Optical Frequency Comb
D. Hayes, D. N. Matsukevich, P. Maunz +7
We demonstrate the use of an optical frequency comb to coherently control and entangle atomic qubits. A train of off-resonant ultrafast laser pulses is used to efficiently and cohe…
Quantum Gates with Phase Stability over Space and Time
I. V. Inlek, G. Vittorini, D. Hucul +2
The performance of a quantum information processor depends on the precise control of phases introduced into the system during quantum gate operations. As the number of operations i…
Arbitrary-speed quantum gates within large ion crystals through minimum control of laser beams
Shi-Liang Zhu, C. Monroe, L. -M. Duan
We propose a scheme to implement arbitrary-speed quantum entangling gates on two trapped ions immersed in a large linear crystal of ions, with minimal control of laser beams. For g…
Quantum Teleportation Between Distant Matter Qubits
S. Olmschenk, D. N. Matsukevich, P. Maunz +3
Quantum teleportation is the faithful transfer of quantum states between systems, relying on the prior establishment of entanglement and using only classical communication during t…
Sensing Atomic Motion from the Zero Point to Room Temperature with Ultrafast Atom Interferometry
K. G. Johnson, B. Neyenhuis, J. Mizrahi +2
We sense the motion of a trapped atomic ion using a sequence of state-dependent ultrafast momentum kicks. We use this atom interferometer to characterize a nearly-pure quantum stat…
Sympathetic Cooling of Trapped Cd+ Isotopes
B. B. Blinov, L. Deslauriers, P. Lee +3
We sympathetically cool a trapped 112Cd+ ion by directly Doppler-cooling a 114Cd+ ion in the same trap. This is the first demonstration of optically addressing a single trapped ion…
Near-Perfect Simultaneous Measurement of a Qubit Register
M. Acton, K. -A. Brickman, P. C. Haljan +3
Simultaneous measurement of multiple qubits stored in hyperfine levels of trapped 111Cd+ ions is realized with an intensified charge-coupled device (CCD) imager. A general theory o…
Entanglement of Trapped-Ion Clock States
P. C. Haljan, P. J. Lee, K. -A. Brickman +3
A Mølmer-Sørensen entangling gate is realized for pairs of trapped Cd ions using magnetic-field insensitive "clock" states and an implementation offering reduced sens…
Observation of Domain Wall Confinement and Dynamics in a Quantum Simulator
W. L. Tan, P. Becker, F. Liu +11
Confinement is a ubiquitous mechanism in nature, whereby particles feel an attractive force that increases without bound as they separate. A prominent example is color confinement…
Planar Ion Trap Geometry for Microfabrication
M. J. Madsen, W. K. Hensinger, D. Stick +2
We describe a novel high aspect ratio radiofrequency linear ion trap geometry that is amenable to modern microfabrication techniques. The ion trap electrode structure consists of a…
Machine learning assisted readout of trapped-ion qubits
Alireza Seif, Kevin A. Landsman, Norbert M. Linke +3
We reduce measurement errors in a quantum computer using machine learning techniques. We exploit a simple yet versatile neural network to classify multi-qubit quantum states, which…
Efficient ground-state cooling of large trapped-ion chains with an EIT tripod scheme
L. Feng, W. L. Tan, A. De +4
We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped Yb ion chain to the quantum ground state. Unlike conventional EIT cooling, we en…
Ultrafast Spin-Motion Entanglement and Interferometry with a Single Atom
J. Mizrahi, C. Senko, B. Neyenhuis +4
We report entanglement of a single atom's hyperfine spin state with its motional state in a timescale of less than 3 ns. We engineer a short train of intense laser pulses to impart…