Self-consistent measurement and state tomography of an exchange-only spin qubit
James Medford,Johannes Beil,Johannes Beil,Jacob M. Taylor,Stephen D. Bartlett,Andrew C. Doherty,Emmanuel I. Rashba,David P. DiVincenzo,David P. DiVincenzo,Hong Lu,Arthur C. Gossard,Charles Marcus,Charles Marcus +12 more
Reads0
Chats0
TLDR
Initiation, full control, and single-shot readout of a three-electron exchange-driven spin qubit is reported, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified.Abstract:
Quantum-dot spin qubits characteristically use oscillating magnetic or electric fields, or quasi-static Zeeman field gradients, to realize full qubit control. For the case of three confined electrons, exchange interaction between two pairs allows qubit rotation around two axes, hence full control, using only electrostatic gates. Here, we report initialization, full control, and single-shot readout of a three-electron exchange-driven spin qubit. Control via the exchange interaction is fast, yielding a demonstrated 75 qubit rotations in less than 2 ns. Measurement and state tomography are performed using a maximum-likelihood estimator method, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified. The methods developed here are generally applicable to systems with state leakage, noisy measurements and non-orthogonal control axes. Full control by electric gates can be accomplished in exchange-driven spin qubits.read more
Citations
More filters
Journal ArticleDOI
A two-qubit logic gate in silicon
Menno Veldhorst,C. H. Yang,J. C. C. Hwang,W. Huang,Juan Pablo Dehollain,Juha T. Muhonen,Stephanie Simmons,Arne Laucht,Fay E. Hudson,Kohei M. Itoh,Andrea Morello,Andrew S. Dzurak +11 more
TL;DR: A two-qubit logic gate is presented, which uses single spins in isotopically enriched silicon and is realized by performing single- and two- qubits operations in a quantum dot system using the exchange interaction, as envisaged in the Loss–DiVincenzo proposal.
Journal ArticleDOI
A programmable two-qubit quantum processor in silicon
Thomas F. Watson,S. G. J. Philips,Erika Kawakami,D. R. Ward,Pasquale Scarlino,Menno Veldhorst,Donald E. Savage,Max G. Lagally,Mark Friesen,Susan Coppersmith,Mark A. Eriksson,Lieven M. K. Vandersypen +11 more
TL;DR: A two-qubit quantum processor in a silicon device is demonstrated in this paper, which can perform the Deutsch-Josza algorithm and the Grover search algorithm on demand.
Journal ArticleDOI
Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot.
Erika Kawakami,Pasquale Scarlino,D. R. Ward,F. R. Braakman,F. R. Braakman,Donald E. Savage,Max G. Lagally,Mark Friesen,Susan Coppersmith,Mark A. Eriksson,Lieven M. K. Vandersypen +10 more
TL;DR: In this paper, the authors demonstrate a long-lived single-electron spin qubit driven by resonant microwave electric fields in a transverse magnetic field gradient from a local micromagnet.
Journal ArticleDOI
Milestones toward Majorana-based quantum computing
David Aasen,Michael Hell,Michael Hell,Ryan V. Mishmash,Andrew Higginbotham,Andrew Higginbotham,Jeroen Danon,Martin Leijnse,Martin Leijnse,Thomas Sand Jespersen,Joshua Folk,Joshua Folk,Charles Marcus,Karsten Flensberg,Jason Alicea +14 more
TL;DR: In this article, a scheme for preparation, manipulation, and read out of Majorana zero modes in semiconducting wires with mesoscopic superconducting islands is introduced, which synthesizes recent advances in materials growth with tools commonly used in quantum-dot experiments, including gate control of tunnel barriers and Coulomb effects, charge sensing, and charge pumping.
Journal ArticleDOI
Interfacing spin qubits in quantum dots and donors—hot, dense, and coherent
Lieven M. K. Vandersypen,Lieven M. K. Vandersypen,Hendrik Bluhm,James S. Clarke,Andrew S. Dzurak,Ryoichi Ishihara,Andrea Morello,David J. Reilly,Lars R. Schreiber,Menno Veldhorst +9 more
TL;DR: In this article, the authors review several strategies that are considered to address this crucial challenge in scaling quantum circuits based on electron spin qubits. But, the wiring and interconnect requirements for quantum circuits are completely different from those for classical circuits, as individual direct current, pulsed and in some cases microwave control signals need to be routed from external sources to every qubit.
References
More filters
Journal ArticleDOI
Charge-insensitive qubit design derived from the Cooper pair box
Jens Koch,Terri M. Yu,Jay M. Gambetta,Andrew Houck,David Schuster,Johannes Majer,Alexandre Blais,Michel Devoret,Steven Girvin,Robert Schoelkopf +9 more
TL;DR: In this paper, the transmon was proposed to operate in a regime of significantly increased ratio of Josephson energy and charging energy, while maintaining sufficient anharmonicity for selective qubit control.
Journal ArticleDOI
Coherent manipulation of coupled electron spins in semiconductor quantum dots.
Jason R. Petta,Jason R. Petta,Jason R. Petta,A. C. Johnson,A. C. Johnson,A. C. Johnson,Jacob M. Taylor,Jacob M. Taylor,Jacob M. Taylor,Edward A. Laird,Edward A. Laird,Edward A. Laird,Amir Yacoby,Amir Yacoby,Amir Yacoby,Mikhail D. Lukin,Mikhail D. Lukin,Mikhail D. Lukin,Charles Marcus,Charles Marcus,Charles Marcus,Micah Hanson,Micah Hanson,Micah Hanson,Arthur C. Gossard,Arthur C. Gossard,Arthur C. Gossard +26 more
TL;DR: It is demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout based on rapid electrical control of the exchange interaction.
Journal ArticleDOI
Coherent control of macroscopic quantum states in a single-Cooper-pair box
TL;DR: In this article, a single-Cooper-pair box with a gate electrode was used to control the coherent quantum state evolution, which modifies the energies of the two charge states non-adiabatically, bringing them into resonance.
Journal ArticleDOI
Driven coherent oscillations of a single electron spin in a quantum dot
Frank H. L. Koppens,Christo Buizert,Klaas-Jan Tielrooij,I. T. Vink,Katja C. Nowack,Tristan Meunier,Leo P. Kouwenhoven,Lieven M. K. Vandersypen +7 more
TL;DR: In this paper, the authors demonstrate the feasibility of operating single-electron spins in a quantum dot as quantum bits by applying short bursts of the oscillating magnetic field and observing about eight oscillations of the spin state during a microsecond burst.
Journal ArticleDOI
Coherent Quantum Dynamics of a Superconducting Flux Qubit
TL;DR: The observed coherent time evolution between two quantum states of a superconducting flux qubit comprising three Josephson junctions in a loop is promising for future solid-state quantum computing.
Related Papers (5)
Coherent manipulation of coupled electron spins in semiconductor quantum dots.
Jason R. Petta,Jason R. Petta,Jason R. Petta,A. C. Johnson,A. C. Johnson,A. C. Johnson,Jacob M. Taylor,Jacob M. Taylor,Jacob M. Taylor,Edward A. Laird,Edward A. Laird,Edward A. Laird,Amir Yacoby,Amir Yacoby,Amir Yacoby,Mikhail D. Lukin,Mikhail D. Lukin,Mikhail D. Lukin,Charles Marcus,Charles Marcus,Charles Marcus,Micah Hanson,Micah Hanson,Micah Hanson,Arthur C. Gossard,Arthur C. Gossard,Arthur C. Gossard +26 more