12 research outputs found
Analyzing the Performance of Variational Quantum Factoring on a Superconducting Quantum Processor
In the near-term, hybrid quantum-classical algorithms hold great potential
for outperforming classical approaches. Understanding how these two computing
paradigms work in tandem is critical for identifying areas where such hybrid
algorithms could provide a quantum advantage. In this work, we study a
QAOA-based quantum optimization algorithm by implementing the Variational
Quantum Factoring (VQF) algorithm. We execute experimental demonstrations using
a superconducting quantum processor and investigate the trade-off between
quantum resources (number of qubits and circuit depth) and the probability that
a given biprime is successfully factored. In our experiments, the integers
1099551473989, 3127, and 6557 are factored with 3, 4, and 5 qubits,
respectively, using a QAOA ansatz with up to 8 layers and we are able to
identify the optimal number of circuit layers for a given instance to maximize
success probability. Furthermore, we demonstrate the impact of different noise
sources on the performance of QAOA and reveal the coherent error caused by the
residual ZZ-coupling between qubits as a dominant source of error in the
superconducting quantum processor
Impact of ionizing radiation on superconducting qubit coherence
The practical viability of any qubit technology stands on long coherence
times and high-fidelity operations, with the superconducting qubit modality
being a leading example. However, superconducting qubit coherence is impacted
by broken Cooper pairs, referred to as quasiparticles, with a density that is
empirically observed to be orders of magnitude greater than the value predicted
for thermal equilibrium by the Bardeen-Cooper-Schrieffer (BCS) theory of
superconductivity. Previous work has shown that infrared photons significantly
increase the quasiparticle density, yet even in the best isolated systems, it
still remains higher than expected, suggesting that another generation
mechanism exists. In this Letter, we provide evidence that ionizing radiation
from environmental radioactive materials and cosmic rays contributes to this
observed difference, leading to an elevated quasiparticle density that would
ultimately limit superconducting qubits of the type measured here to coherence
times in the millisecond regime. We further demonstrate that introducing
radiation shielding reduces the flux of ionizing radiation and positively
correlates with increased coherence time. Albeit a small effect for today's
qubits, reducing or otherwise mitigating the impact of ionizing radiation will
be critical for realizing fault-tolerant superconducting quantum computers.Comment: 16 pages, 12 figure
Learning-based Calibration of Flux Crosstalk in Transmon Qubit Arrays
Superconducting quantum processors comprising flux-tunable data and coupler
qubits are a promising platform for quantum computation. However, magnetic flux
crosstalk between the flux-control lines and the constituent qubits impedes
precision control of qubit frequencies, presenting a challenge to scaling this
platform. In order to implement high-fidelity digital and analog quantum
operations, one must characterize the flux crosstalk and compensate for it. In
this work, we introduce a learning-based calibration protocol and demonstrate
its experimental performance by calibrating an array of 16 flux-tunable
transmon qubits. To demonstrate the extensibility of our protocol, we simulate
the crosstalk matrix learning procedure for larger arrays of transmon qubits.
We observe an empirically linear scaling with system size, while maintaining a
median qubit frequency error below kHz
High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler
We propose and demonstrate an architecture for fluxonium-fluxonium two-qubit
gates mediated by transmon couplers (FTF, for fluxonium-transmon-fluxonium).
Relative to architectures that exclusively rely on a direct coupling between
fluxonium qubits, FTF enables stronger couplings for gates using
non-computational states while simultaneously suppressing the static
controlled-phase entangling rate () down to kHz levels, all without
requiring strict parameter matching. Here we implement FTF with a flux-tunable
transmon coupler and demonstrate a microwave-activated controlled-Z (CZ) gate
whose operation frequency can be tuned over a 2 GHz range, adding frequency
allocation freedom for FTF's in larger systems. Across this range,
state-of-the-art CZ gate fidelities were observed over many bias points and
reproduced across the two devices characterized in this work. After optimizing
both the operation frequency and the gate duration, we achieved peak CZ
fidelities in the 99.85-99.9\% range. Finally, we implemented model-free
reinforcement learning of the pulse parameters to boost the mean gate fidelity
up to , averaged over roughly an hour between scheduled
training runs. Beyond the microwave-activated CZ gate we present here, FTF can
be applied to a variety of other fluxonium gate schemes to improve gate
fidelities and passively reduce unwanted interactions.Comment: 23 pages, 16 figure
Towards quantum information processing with diamond color centers
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 59-63).The DiVincenco requirements summarize the key properties that quantum systems should have to be useful for quantum computing. The work in this thesis focuses on one of the leading solid-state quantum systems, the nitrogen vacancy (NV) center in diamond. The NV has emerged as an excellent quantum sensor, in which quantum logic techniques can significantly improve performance. However, a remaining problem concerns the rate and fidelity of NV spin measurement. To address this problem in this thesis we first propose and theoretically demonstrate a scheme for spatially robust state-selective transitions with over 99.9% fidelity between different spin states in zero-field splitting. Furthermore, another central challenge tackled in this work is the efficient collection of the emitter's fluorescence. Optical antennas are appealing as they offer directional emission together with spontaneous emission rate enhancement across a broad emitter spectrum. We introduce and optimize metal-dielectric nano-antenna designs recessed into a diamond substrate and aligned with quantum emitters. We analyze trade-offs between external quantum efficiency, collection efficiency, Purcell factor, and overall collected photon rate. This analysis shows that an optimized metal-dielectric hybrid structure can increase the collected photon rate from a nitrogen vacancy center by over two orders of magnitude compared to a bare emitter. As a result, these metal-dielectric antennas should enable single-shot electron spin measurements of NV centers at room temperature.by Amir H. Karamlou.M. Eng
Quantum Simulation of Many-body Systems with Superconducting Qubits
The study of interacting many-body quantum systems is central to the understanding of wide a range of physical phenomena in condensed-matter systems, quantum gravity, and quantum circuits. However, quantum systems are often hard to study analytically, and the classical computing resources required for simulating them scale exponentially with the size of the system. In this thesis, we discuss utilizing superconducting quantum circuits as a wellcontrolled quantum platform for probing the out-of-equilibrium dynamics and the properties of many-body quantum systems. We use a 3×3 array of superconducting transmon qubits to study the dynamics of a particle under the tight-binding model, and probe quantum information propagation by measuring out-of-time-ordered correlators (OTOCs). Using a 4×4 qubit array, we probe entanglement across the energy spectrum of a hard-core Bose-Hubbard lattice by extracting correlation lengths and entanglement entropy of superposition states generated in particular regions of the spectrum, from the band center to its edge. The results presented in this thesis are in close quantitative agreement with numerical simulations. The demonstrated level of experimental control and accuracy in extracting the system observables of interest is extensible to larger superconducting quantum simulators and will enable the exploration of larger, non-integrable systems where numerical simulations become intractable.Ph.D
Probing quantum information propagation with out-of-time-ordered correlators
Interacting many-body quantum systems show a rich array of physical phenomena
and dynamical properties, but are notoriously difficult to study: they are
challenging analytically and exponentially difficult to simulate on classical
computers. Small-scale quantum information processors hold the promise to
efficiently emulate these systems, but characterizing their dynamics is
experimentally challenging, requiring probes beyond simple correlation
functions and multi-body tomographic methods. Here, we demonstrate the
measurement of out-of-time-ordered correlators (OTOCs), one of the most
effective tools for studying quantum system evolution and processes like
quantum thermalization. We implement a 3x3 two-dimensional hard-core
Bose-Hubbard lattice with a superconducting circuit, study its
time-reversibility by performing a Loschmidt echo, and measure OTOCs that
enable us to observe the propagation of quantum information. A central
requirement for our experiments is the ability to coherently reverse time
evolution, which we achieve with a digital-analog simulation scheme. In the
presence of frequency disorder, we observe that localization can partially be
overcome with more particles present, a possible signature of many-body
localization in two dimensions
Quantum transport and localization in 1d and 2d tight-binding lattices
AbstractParticle transport and localization phenomena in condensed-matter systems can be modeled using a tight-binding lattice Hamiltonian. The ideal experimental emulation of such a model utilizes simultaneous, high-fidelity control and readout of each lattice site in a highly coherent quantum system. Here, we experimentally study quantum transport in one-dimensional and two-dimensional tight-binding lattices, emulated by a fully controllable 3 × 3 array of superconducting qubits. We probe the propagation of entanglement throughout the lattice and extract the degree of localization in the Anderson and Wannier-Stark regimes in the presence of site-tunable disorder strengths and gradients. Our results are in quantitative agreement with numerical simulations and match theoretical predictions based on the tight-binding model. The demonstrated level of experimental control and accuracy in extracting the system observables of interest will enable the exploration of larger, interacting lattices where numerical simulations become intractable.</jats:p
High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler
We propose and demonstrate an architecture for fluxonium-fluxonium two-qubit gates mediated by transmon couplers (FTF, for fluxonium-transmon-fluxonium). Relative to architectures that exclusively rely on a direct coupling between fluxonium qubits, FTF enables stronger couplings for gates using noncomputational states while simultaneously suppressing the static controlled-phase entangling rate (ZZ) down to kilohertz levels, all without requiring strict parameter matching. Here, we implement FTF with a flux-tunable transmon coupler and demonstrate a microwave-activated controlled-Z (CZ) gate whose operation frequency can be tuned over a 2-GHz range, adding frequency allocation freedom for FTFs in larger systems. Across this range, state-of-the-art CZ gate fidelities are observed over many bias points and reproduced across the two devices characterized in this work. After optimizing both the operation frequency and the gate duration, we achieve peak CZ fidelities in the 99.85%–99.9% range. Finally, we implement model-free reinforcement learning of the pulse parameters to boost the mean gate fidelity up to 99.922%±0.009%, averaged over roughly an hour between scheduled training runs. Beyond the microwave-activated CZ gate we present here, FTF can be applied to a variety of other fluxonium gate schemes to improve gate fidelities and passively reduce unwanted ZZ interactions
Hexagonal boron nitride as a low-loss dielectric for superconducting quantum circuits and qubits
Dielectrics with low loss at microwave frequencies are imperative for
high-coherence solid-state quantum computing platforms. We study the dielectric
loss of hexagonal boron nitride (hBN) thin films in the microwave regime by
measuring the quality factor of parallel-plate capacitors (PPCs) made of
NbSe-hBN-NbSe heterostructures integrated into superconducting
circuits. The extracted microwave loss tangent of hBN is bounded to be at most
in the mid-10 range in the low temperature, single-photon regime. We
integrate hBN PPCs with aluminum Josephson junctions to realize transmon qubits
with coherence times reaching 25 s, consistent with the hBN loss tangent
inferred from resonator measurements. The hBN PPC reduces the qubit feature
size by approximately two-orders of magnitude compared to conventional
all-aluminum coplanar transmons. Our results establish hBN as a promising
dielectric for building high-coherence quantum circuits with substantially
reduced footprint and, with a high energy participation that helps to reduce
unwanted qubit cross-talk