Alexey V. Gorshkov
University of Maryland, College Park
OpticsQuantum entanglementPhysicsStatistical physicsElectromagnetically induced transparencyPhotonQuantum simulatorQuantum informationHamiltonian (quantum mechanics)Bound stateAtomic physicsMaterials scienceQubitCondensed matter physicsIsing modelQuantum computerQuantum mechanicsRydberg formulaQuantumOptical latticeDissipative system
345Publications
54H-index
8,147Citations
Publications 315
Newest
#1Kevin C. CoxH-Index: 13
#2Przemyslaw BieniasH-Index: 13
Last. Alexey V. GorshkovH-Index: 54
view all 6 authors...
We present a method for network-capable quantum computing that relies on holographic spin-wave excitations stored collectively in ensembles of qubits. We construct an orthogonal basis of spin waves in a one-dimensional array and show that high-fidelity universal linear controllability can be achieved using only phase shifts, applied in both momentum and position space. Neither single-site addressability nor high single-qubit cooperativity is required, and the spin waves can be read out with high...
1 Citations
#1Kevin C. CoxH-Index: 13
#2Przemyslaw BieniasH-Index: 13
Last. Alexey V. GorshkovH-Index: 54
view all 6 authors...
Spin-wave excitations in ensembles of atoms are gaining attention as a quantum information resource. However, current techniques with atomic spin waves do not achieve universal quantum information processing. We conduct a theoretical analysis of methods to create a high-capacity universal quantum processor and network node using an ensemble of laser-cooled atoms, trapped in a one-dimensional periodic potential and coupled to a ring cavity. We describe how to establish linear quantum processing u...
1 Citations
#1Oles Shtanko (UMD: University of Maryland, College Park)H-Index: 7
#2Abhinav Deshpande (UMD: University of Maryland, College Park)H-Index: 6
Last. Alexey V. Gorshkov (UMD: University of Maryland, College Park)H-Index: 54
view all 4 authors...
Interactions between particles are usually a resource for quantum computing, making quantum many-body systems intractable by any known classical algorithm. In contrast, noise is typically considered as being inimical to quantum many-body correlations, ultimately leading the system to a classically tractable state. This work shows that noise represented by two-body processes, such as pair loss, plays the same role as many-body interactions and makes otherwise classically simulable systems univers...
Source
#1Oles Shtanko (UMD: University of Maryland, College Park)H-Index: 7
#2Abhinav Deshpande (UMD: University of Maryland, College Park)H-Index: 6
Last. Alexey V. Gorshkov (UMD: University of Maryland, College Park)H-Index: 54
view all 4 authors...
Interactions between particles are usually a resource for quantum computing, making quantum many-body systems intractable by any known classical algorithm. In contrast, noise is typically considered as being inimical to quantum many-body correlations, ultimately leading the system to a classically tractable state. This work shows that noise represented by two-body processes, such as pair loss, plays the same role as many-body interactions and makes otherwise classically simulable systems univers...
Source
#1Jeremy T. YoungH-Index: 9
#2Przemyslaw BieniasH-Index: 13
Last. Alexey V. GorshkovH-Index: 54
view all 5 authors...
2 CitationsSource
The presence of noise or the interaction with an environment can radically change the dynamics of observables of an otherwise isolated quantum system. We derive a bound on the speed with which observables of open quantum systems evolve. This speed limit divides into Mandalestam and Tamm's original time-energy uncertainty relation and a time-information uncertainty relation recently derived for classical systems, generalizing both to open quantum systems. By isolating the coherent and incoherent ...
#1Minh C. Tran (UMD: University of Maryland, College Park)H-Index: 11
#2Andrew Y. Guo (UMD: University of Maryland, College Park)H-Index: 6
Last. Alexey V. Gorshkov (UMD: University of Maryland, College Park)H-Index: 54
view all 5 authors...
A certain class of quantum systems with long-range interactions can exhibit nonlocal behavior and transfer quantum information at the maximum rates allowed by quantum mechanics.
2 CitationsSource
Quantum many-body scars (QMBS) constitute a new quantum dynamical regime in which rare "scarred" eigenstates mediate weak ergodicity breaking. One open question is to understand the most general setting in which these states arise. In this work, we develop a generic construction that embeds a new class of QMBS, rainbow scars, into the spectrum of an arbitrary Hamiltonian. Unlike other examples of QMBS, rainbow scars display extensive bipartite entanglement entropy while retaining a simple entang...
2 Citations
#1Lucas T. BradyH-Index: 12
#2Lucas KociaH-Index: 7
Last. Alexey V. GorshkovH-Index: 54
view all 6 authors...
Analog quantum algorithms are formulated in terms of Hamiltonians rather than unitary gates and include quantum adiabatic computing, quantum annealing, and the quantum approximate optimization algorithm (QAOA). These algorithms are promising candidates for near-term quantum applications, but they often require fine tuning via the annealing schedule or variational parameters. In this work, we explore connections between these analog algorithms, as well as limits in which they become approximation...
2 Citations
#1Jeremy T. YoungH-Index: 9
#2Alexey V. GorshkovH-Index: 54
Last. Ian B. SpielmanH-Index: 49
view all 3 authors...
The implementation of a combination of continuous weak measurement and classical feedback provides a powerful tool for controlling the evolution of quantum systems. In this work, we investigate the potential of this approach from three perspectives. First, we consider a double-well system in the classical large-atom-number limit, deriving the exact equations of motion in the presence of feedback. Second, we consider the same system in the limit of small atom number, revealing the effect that qua...