On Monday, September 30, 2019 at 4:09:17 PM UTC-5, John Clark wrote: > > For the first time a fully controllable ten-qubit spin register with a > quantum memory of 75 seconds has been developed. And they managed to > achieve this without using any error correcting at all which the > researchers believe is the next step; they conclude their article in the > September 11 2019 Physical review with: > "*our multiqubit register paves the way for the realization of > rudimentary few-node quantum networks comprising tens of qubits. This will > enable the investigation of basic error correction codes and algorithms > over quantum networks*". > > A Ten-Qubit Solid-State Spin Register with Quantum Memory Over One Minute > <https://journals.aps.org/prx/pdf/10.1103/PhysRevX.9.031045> > > John K Clark >
If they can sustain a qubit for one minute they must have a fairly robust quantum error correction code. LC https://arxiv.org/abs/1905.02094 A 10-qubit solid-state spin register with quantum memory up to one minute C. E. Bradley <https://arxiv.org/search/quant-ph?searchtype=author&query=Bradley%2C+C+E>, J. Randall <https://arxiv.org/search/quant-ph?searchtype=author&query=Randall%2C+J>, M. H. Abobeih <https://arxiv.org/search/quant-ph?searchtype=author&query=Abobeih%2C+M+H>, R. C. Berrevoets <https://arxiv.org/search/quant-ph?searchtype=author&query=Berrevoets%2C+R+C> , M. J. Degen <https://arxiv.org/search/quant-ph?searchtype=author&query=Degen%2C+M+J>, M. A. Bakker <https://arxiv.org/search/quant-ph?searchtype=author&query=Bakker%2C+M+A>, M. Markham <https://arxiv.org/search/quant-ph?searchtype=author&query=Markham%2C+M>, D. J. Twitchen <https://arxiv.org/search/quant-ph?searchtype=author&query=Twitchen%2C+D+J> , T. H. Taminiau <https://arxiv.org/search/quant-ph?searchtype=author&query=Taminiau%2C+T+H> (Submitted on 6 May 2019 (v1 <https://arxiv.org/abs/1905.02094v1>), last revised 9 May 2019 (this version, v2)) Spins associated to single defects in solids provide promising qubits for quantum information processing and quantum networks. Recent experiments have demonstrated long coherence times, high-fidelity operations and long-range entanglement. However, control has so far been limited to a few qubits, with entangled states of three spins demonstrated. Realizing larger multi-qubit registers is challenging due to the need for quantum gates that avoid crosstalk and protect the coherence of the complete register. In this paper, we present novel decoherence-protected gates that combine dynamical decoupling of an electron spin with selective phase-controlled driving of nuclear spins. We use these gates to realize a 10-qubit quantum register consisting of the electron spin of a nitrogen-vacancy center and 9 nuclear spins in diamond. We show that the register is fully connected by generating entanglement between all 45 possible qubit pairs, and realize genuine multipartite entangled states with up to 7 qubits. Finally, we investigate the register as a multi-qubit memory. We show coherence times up to 63(2) seconds - the longest reported for a single solid-state qubit - and demonstrate that two-qubit entangled states can be stored for over 10 seconds. Our results enable the control of large quantum registers with long coherence times and therefore open the door to advanced quantum algorithms and quantum networks with solid-state spin qubits. Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Journal reference: Phys. Rev. X 9, 031045 (2019) DOI: 10.1103/PhysRevX.9.031045 <https://arxiv.org/ct?url=https%3A%2F%2Fdx.doi.org%2F10.1103%2FPhysRevX.9.031045&v=785c2928> Cite as: arXiv:1905.02094 <https://arxiv.org/abs/1905.02094> [quant-ph] (or arXiv:1905.02094v2 <https://arxiv.org/abs/1905.02094v2> [quant-ph] for this version) -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/700eb606-a3dd-484f-98cc-372f27a6f0bf%40googlegroups.com.
