105 citations · 618 across the 32 of their papers we have counts for
33 papers
Enhancing the phase sensitivity of a Mach-Zehnder interferometer beyond the Heisenberg limit through dynamic squeezing
Lakshya Bhardwaj, Ankit Tiwari, Mohan Sarovar +1
We propose a method to enhance the phase sensitivity of a Mach-Zehnder interferometer, independent of its input states. This is achieved by applying squeezing sequences to one arm…
Setting angles in quantum approximate optimization at utility-scale
Maosheng Guo, Joel Jurado Diaz, Anurag Ramesh +16
The quantum approximate optimization algorithm (QAOA) is a powerful heuristic that seeks to solve combinatorial optimization problems using quantum hardware and classical optimizat…
Amplification of bosonic interactions through squeezing in the presence of decoherence
Ankit Tiwari, Cecilia Cormick, Christian Arenz
We consider the amplification of bosonic interactions through parametric control that implements squeezing along orthogonal quadratures. We show that bosonic interactions described…
Loss tolerant cross-Kerr enhancement via modulated squeezing
Ankit Tiwari, Daniel Burgarth, Linran Fan +2
We develop squeezing protocols to enhance cross-Kerr interactions. We show that through alternating between squeezing along different quadratures of a single photonic mode, the cro…
Entanglement engineering of optomechanical systems by reinforcement learning
Li-Li Ye, Christian Arenz, Joseph M. Lukens +1
Entanglement is fundamental to quantum information science and technology, yet controlling and manipulating entanglement -- so-called entanglement engineering -- for arbitrary quan…
Hamiltonian simulation in Zeno subspaces
Kasra Rajabzadeh Dizaji, Ariq Haqq, Alicia B. Magann +1
We investigate the quantum Zeno effect as a framework for designing and analyzing quantum algorithms for Hamiltonian simulation. We show that frequent projective measurements of an…
Learning How to Dynamically Decouple
Arefur Rahman, Daniel J. Egger, Christian Arenz
Current quantum computers suffer from noise that stems from interactions between the quantum system that constitutes the quantum device and its environment. These interactions can…
Experimental speedup of quantum dynamics through squeezing
S. C. Burd, H. M. Knaack, R. Srinivas +9
We show experimentally that a broad class of interactions involving quantum harmonic oscillators can be made stronger (amplified) using a unitary squeezing protocol. While our demo…
Robustness of random-control quantum-state tomography
Jingcheng Wang, Shaoliang Zhang, Jianming Cai +3
In a recently demonstrated quantum-state tomography scheme [Phys. Rev. Lett. 124, 010405 (2020)], a random control field is locally applied to a multipartite system to reconstruct…
Quantum tracking control of the orientation of symmetric top molecules
Alicia B. Magann, Tak-San Ho, Christian Arenz +1
The goal of quantum tracking control is to identify shaped fields to steer observable expectation values along designated time-dependent tracks. The fields are determined via an it…
Randomized adaptive quantum state preparation
Alicia B. Magann, Sophia E. Economou, Christian Arenz
We develop an adaptive method for quantum state preparation that utilizes randomness as an essential component and that does not require classical optimization. Instead, a cost fun…
Progress toward favorable landscapes in quantum combinatorial optimization
Juneseo Lee, Alicia B. Magann, Herschel A. Rabitz +1
The performance of variational quantum algorithms relies on the success of using quantum and classical computing resources in tandem. Here, we study how these quantum and classical…
From pulses to circuits and back again: A quantum optimal control perspective on variational quantum algorithms
Alicia B. Magann, Christian Arenz, Matthew D. Grace +5
The last decade has witnessed remarkable progress in the development of quantum technologies. Although fault-tolerant devices likely remain years away, the noisy intermediate-scale…
Assessing three closed-loop learning algorithms by searching for high-quality quantum control pulses
Xiao-dong Yang, Christian Arenz, Istvan Pelczer +4
Designing a high-quality control is crucial for reliable quantum computation. Among the existing approaches, closed-loop leaning control is an effective choice. Its efficiency depe…
Drawing together control landscape and tomography principles
Christian Arenz, Herschel Rabitz
The ability to control quantum systems using shaped fields as well as to infer the states of such controlled systems from measurement data are key tasks in the design and operation…
Complete Quantum-State Tomography with a Local Random Field
Pengcheng Yang, Min Yu, Ralf Betzholz +2
Single-qubit measurements are typically insufficient for inferring arbitrary quantum states of a multi-qubit system. We show that if the system can be fully controlled by driving a…
Emerging unitary evolutions in dissipatively coupled systems
C. Arenz, A. Metelmann
Having a broad range of methods available for implementing unitary operations is crucial for quantum information tasks. We study a dissipative process commonly used to describe dis…
An upper bound on the time required to implement unitary operations
Juneseo Lee, Christian Arenz, Daniel Burgarth +1
We derive an upper bound for the time needed to implement a generic unitary transformation in a dimensional quantum system using control fields. We show that given the abil…
Combining the synergistic control capabilities of modelling and experiments: illustration of finding a minimum time quantum objective
Qi-Ming Chen, Xiaodong Yang, Christian Arenz +4
A common way to manipulate a quantum system, for example spins or artificial atoms, is to use properly tailored control pulses. In order to accomplish quantum information tasks bef…
Quantum Control Landscape of Bipartite Systems
Robert L. Kosut, Christian Arenz, Herschel Rabitz
The control landscape of a quantum system interacting with another quantum system is studied. Only system is accessible through time dependent controls, while system B…
Amplification of quadratic Hamiltonians
Christian Arenz, Denys I. Bondar, Daniel Burgarth +2
Speeding up the dynamics of a quantum system is of paramount importance for quantum technologies. However, in finite dimensions and without full knowledge of the details of the sys…
Dependence of the Quantum Speed Limit on System Size and Control Complexity
Juneseo Lee, Christian Arenz, Herschel Rabitz +1
We extend the work in New J. Phys. 19, 103015 (2017) by deriving a lower bound for the minimum time necessary to implement a unitary transformation on a generic, closed quantum sys…
Controlling qubit networks in polynomial time
Christian Arenz, Herschel Rabitz
Future quantum devices often rely on favourable scaling with respect to the system components. To achieve desirable scaling, it is therefore crucial to implement unitary transforma…
Dynamical Decoupling of Unbounded Hamiltonians
Christian Arenz, Daniel Burgarth, Paolo Facchi +1
We investigate the possibility to suppress interactions between a finite dimensional system and an infinite dimensional environment through a fast sequence of unitary kicks on the…