304 citations · 1.4k across the 34 of their papers we have counts for
24 papers · 1 filter
Gate-dependent offset charge shifts and anharmonicity in gatemon qubits in the weak tunneling regime
Utkan Güngördü, Rusko Ruskov, Silas Hoffman +3
Gatemon qubits are based on a superconductor-quantum dot-superconductor (S-QD-S) junction which enables in situ electrostatic tuning via a gate electrode. For a single-channel QD t…
Ultra-dispersive resonator readout of a quantum-dot qubit using longitudinal coupling
Benjamin Harpt, J. Corrigan, Nathan Holman +10
We perform readout of a quantum-dot hybrid qubit coupled to a superconducting resonator through a parametric, longitudinal interaction mechanism. Our experiments are performed with…
Quantum dynamics of semiconductor quantum dot Josephson junctions
Utkan Güngördü, Rusko Ruskov, Silas Hoffman +3
Josephson junctions constructed from superconductor-semiconductor-superconductor heterostructures have been used to realize a variety of voltage-tunable superconducting quantum dev…
Longitudinal (curvature) couplings of an -level qudit to a superconducting resonator at the adiabatic limit and beyond
Rusko Ruskov, Charles Tahan
Understanding how and to what magnitude solid-state qubits couple to metallic wires is crucial to the design of quantum systems such as quantum computers. Here, we investigate the…
Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
Rusko Ruskov, Charles Tahan
We propose entangling operations based on the energy curvature couplings of encoded spin qubits to a superconducting cavity, exploring the non-linear qubit response to a gate volta…
Induced quantum dot probe for material characterization
Yun-Pil Shim, Rusko Ruskov, Hilary M. Hurst +1
We propose a non-destructive means of characterizing a semiconductor wafer via measuring parameters of an induced quantum dot on the material system of interest with a separate pro…
Electron g-factor of valley states in realistic silicon quantum dots
Rusko Ruskov, Menno Veldhorst, Andrew S. Dzurak +1
We theoretically model the spin-orbit interaction in silicon quantum dot devices, relevant for quantum computation and spintronics. Our model is based on a modified effective mass…
Quantum-limited measurement of spin qubits via curvature coupling to a cavity
Rusko Ruskov, Charles Tahan
We investigate coupling an encoded spin qubit to a microwave resonator via qubit energy level curvature versus gate voltage. This approach enables quantum non-demolition readout wi…
Spin-orbit coupling and operation of multi-valley spin qubits
M. Veldhorst, R. Ruskov, C. H. Yang +7
Spin qubits composed of either one or three electrons are realized in a quantum dot formed at a Si/SiO_2-interface in isotopically enriched silicon. Using pulsed electron spin reso…
Electron spin resonance and spin-valley physics in a silicon double quantum dot
Xiaojie Hao, Rusko Ruskov, Ming Xiao +2
Silicon quantum dots are a leading approach for solid-state quantum bits. However, developing this technology is complicated by the multi-valley nature of silicon. Here we observe…
Spin-valley lifetimes in a silicon quantum dot with tunable valley splitting
C. H. Yang, A. Rossi, R. Ruskov +7
Although silicon is a promising material for quantum computation, the degeneracy of the conduction band minima (valleys) must be lifted with a splitting sufficient to ensure format…
On-chip cavity quantum phonodynamics with an acceptor qubit in silicon
Rusko Ruskov, Charles Tahan
We describe a chip-based, solid-state analogue of cavity-QED utilizing acoustic phonons instead of photons. We show how long-lived and tunable acceptor impurity states in silicon n…
Phonitons as a sound-based analogue of cavity quantum electrodynamics
O. O. Soykal, Rusko Ruskov, Charles Tahan
A quantum mechanical superposition of a long-lived, localized phonon and a matter excitation is described. We identify a realization in strained silicon: a low-lying donor transiti…
Manipulation of double-dot spin qubit by continuous noisy measurement
Rusko Ruskov, Viatcheslav V. Dobrovitski, Bruce N. Harmon
We consider evolution of a double quantum dot (DQD) two-electron spin qubit which is continuously weakly measured with a linear charge detector (quantum point contact). Since the i…
Crossover of phase qubit dynamics in presence of negative-result weak measurement
Rusko Ruskov, Ari Mizel, Alexander N. Korotkov
Coherent dynamics of a superconducting phase qubit is considered in the presence of both unitary evolution due to microwave driving and continuous non-unitary collapse due to negat…
Continuous quantum feedback of coherent oscillations in a solid-state qubit
Qin Zhang, Rusko Ruskov, Alexander N. Korotkov
We have analyzed theoretically the operation of the Bayesian quantum feedback of a solid-state qubit, designed to maintain perfect coherent oscillations in the qubit for arbitraril…
Quantum Zeno stabilization in weak continuous measurement of two qubits
Rusko Ruskov, Alexander N. Korotkov, Ari Mizel
We have studied quantum coherent oscillations of two qubits under continuous measurement by a symmetrically coupled mesoscopic detector. The analysis is based on a Bayesian formali…
Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback
Rusko Ruskov, Keith Schwab, Alexander N. Korotkov
We analyze squeezing of the nanoresonator state produced by periodic measurement of position by a quantum point contact or a single-electron transistor. The mechanism of squeezing…
Quantum Nondemolition Squeezing of a Nanomechanical Resonator
Rusko Ruskov, Keith Schwab, Alexander N. Korotkov
We show that the nanoresonator position can be squeezed significantly below the ground state level by measuring the nanoresonator with a quantum point contact or a single-electron…
Quadratic Quantum Measurements
Wenjin Mao, Dmitri V. Averin, Rusko Ruskov +1
We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that quadratic measurements should have non-trivial quantum information properties, prov…
Entanglement of solid-state qubits by measurement
Rusko Ruskov, Alexander N. Korotkov
We show that two identical solid-state qubits can be made fully entangled (starting from completely mixed state) with probability 1/4 just measuring them by a detector, equally cou…
Quantum feedback control of a solid-state qubit
Rusko Ruskov, Alexander N. Korotkov
We have studied theoretically the basic operation of a quantum feedback loop designed to maintain a desired phase of quantum coherent oscillations in a single solid-state qubit. Th…
Spectrum of qubit oscillations from Bloch equations
Rusko Ruskov, Alexander N. Korotkov
We have developed a formalism suitable for calculation of the output spectrum of a detector continuously measuring quantum coherent oscillations in a solid-state qubit, starting fr…
Quantum feedback control of a solid-state two-level system
Rusko Ruskov, Alexander N. Korotkov
We have studied theoretically the basic operation of a quantum feedback loop designed to maintain the desired phase of quantum coherent oscillations in a two-level system. Such fee…