273 citations · 1.9k across the 49 of their papers we have counts for
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Spin Squeezing as a Probe of Emergent Quantum Orders
Ilija K. Nikolov, Stephen Carr, Adrian G. Del Maestro +2
Nuclear magnetic resonance (NMR) experiments can reveal local properties in materials, but are often limited by the low signal-to-noise ratio. Spin squeezed states have an improved…
Spectral diffusion of phosphorus donors in silicon at high magnetic field
Lihuang Zhu, Ethan Q. Williams, Johan van Tol +1
We study the central spin physics of a phosphorus donor electron in silicon interacting with a silicon-29 bath at high magnetic field (8.59 T). We find that the spectral diffusion…
Deep reinforcement learning for quantum Hamiltonian engineering
Pai Peng, Xiaoyang Huang, Chao Yin +3
Engineering desired Hamiltonian in quantum many-body systems is essential for applications such as quantum simulation, computation and sensing. Conventional quantum Hamiltonian eng…
Prethermal quasiconserved observables in Floquet quantum systems
Chao Yin, Pai Peng, Xiaoyang Huang +2
Prethermalization, by introducing emergent quasiconserved observables, plays a crucial role in protecting Floquet many-body phases over exponentially long time, while the ultimate…
Observation of Floquet prethermalization in dipolar spin chains
Pai Peng, Chao Yin, Xiaoyang Huang +2
Periodically driven Floquet quantum systems provide a promising platform to investigate novel physics out of equilibrium. Unfortunately, the drive generically heats up the system t…
Hyperpolarized relaxometry based nuclear T1 noise spectroscopy in hybrid diamond quantum registers
Ashok Ajoy, Ben Safvati, Raffi Nazaryan +14
Understanding the origins of spin lifetimes in hybrid quantum systems is a matter of current importance in several areas of quantum information and sensing. Methods that spectrally…
Emergent prethermalization signatures in out-of-time ordered correlations
Ken Xuan Wei, Pai Peng, Oles Shtanko +4
How a many-body quantum system thermalizes --or fails to do so-- under its own interaction is a fundamental yet elusive concept. Here we demonstrate nuclear magnetic resonance obse…
Superadiabatic Control of Quantum Operations
Jonathan Vandermause, Chandrasekhar Ramanathan
Adiabatic pulses are used extensively to enable robust control of quantum operations. We introduce a new approach to adiabatic control that uses the superadiabatic quality or -f…
Equivalent Hamiltonians for State to State Transfer in the Case of Partial Quantum Control
Ian N. Hincks, David G. Cory, Chandrasekhar Ramanathan
Given a fixed initial state, a desired Hamiltonian, and an amount of time, we provide a complete characterization of the set of Hamiltonians which perform the same action as the de…
Experimental characterization of coherent magnetization transport in a one-dimensional spin system
Chandrasekhar Ramanathan, Paola Cappellaro, Lorenza Viola +1
We experimentally characterize the non-equilibrium, room-temperature magnetization dynamics of a spin chain evolving under an effective double-quantum Hamiltonian. We show that the…
Coherent state transfer via highly mixed quantum spin chains
Paola Cappellaro, Lorenza Viola, Chandrasekhar Ramanathan
Spin chains have been proposed as quantum wires in many quantum information processing architectures. Coherent transmission of quantum information over short distances is enabled b…
NMR multiple quantum coherences in quasi-one-dimensional spin systems: Comparison with ideal spin-chain dynamics
Wenxian Zhang, Paola Cappellaro, Natania Antler +5
The 19F spins in a crystal of fluorapatite have often been used to experimentally approximate a one-dimensional spin system. Under suitable multi-pulse control, the nuclear spin dy…
Quantum information processing using nuclear and electron magnetic resonance: review and prospects
J. Baugh, J. Chamilliard, C. M. Chandrashekar +13
This paper describes recent progress using nuclear magnetic resonance (NMR) as a platform for implementing quantum information processing (QIP) tasks. The basic ideas of NMR QIP ar…
Universal Control of Nuclear Spins Via Anisotropic Hyperfine Interactions
Jonathan S. Hodges, Jamie C. Yang, Chandrasekhar Ramanathan +1
We show that nuclear spin subsystems can be completely controlled via microwave irradiation of resolved anisotropic hyperfine interactions with a nearby electron spin. Such indirec…
Dynamics and Control of a Quasi-1D Spin System
Paola Cappellaro, Chandrasekhar Ramanathan, David G. Cory
We study experimentally a system comprised of linear chains of spin-1/2 nuclei that provides a test-bed for multi-body dynamics and quantum information processing. This system is a…
Simulations of Information Transport in Spin Chains
Paola Cappellaro, Chandrasekhar Ramanathan, David G. Cory
Transport of quantum information in linear spin chains has been the subject of much theoretical work. Experimental studies by nuclear spin systems in solid-state by NMR (a natural…
Fidelity enhancement by logical qubit encoding
Michael K. Henry, Chandrasekhar Ramanathan, Jonathan S. Hodges +4
We demonstrate coherent control of two logical qubits encoded in a decoherence free subspace (DFS) of four dipolar-coupled protons in an NMR quantum information processor. A pseudo…
Signatures of incoherence in a quantum information processor
Michael K. Henry, Alexey V. Gorshkov, Yaakov S. Weinstein +8
Incoherent noise is manifest in measurements of expectation values when the underlying ensemble evolves under a classical distribution of unitary processes. While many incoherent p…
A solid-state NMR three-qubit homonuclear system for quantum information processing: control and characterization
Jonathan Baugh, Osama Moussa, Colm A. Ryan +4
A three-qubit 13C solid-state nuclear magnetic resonance (NMR) system for quantum information processing, based on the malonic acid molecule, is used to demonstrate high-fidelity u…
Entanglement Assisted Metrology
Paola Cappellaro, Joseph Emerson, Nicolas Boulant +3
We propose a new approach to the measurement of a single spin state, based on nuclear magnetic resonance (NMR) techniques and inspired by the coherent control over many-body system…
Selective coherence transfers in homonuclear dipolar coupled spin systems
Chandrasekhar Ramanathan, Suddhasattwa Sinha, Jonathan Baugh +2
Mapping the physical dipolar Hamiltonian of a solid-state network of nuclear spins onto a system of nearest-neighbor couplings would be extremely useful for a variety of quantum in…
Encoding multiple quantum coherences in non-commuting bases
Chandrasekhar Ramanathan, Hyungjoon Cho, Paola Cappellaro +2
Multiple quantum coherences are typically characterised by their coherence number and the number of spins that make up the state, though only the coherence number is normally measu…
NMR Quantum Information Processing
Chandrasekhar Ramanathan, Nicolas Boulant, Zhiying Chen +3
Nuclear Magnetic Resonance (NMR) has provided a valuable experimental testbed for quantum information processing (QIP). Here, we briefly review the use of nuclear spins as qubits,…