Re: Quantum Computing News

[Philip Thrift]

GPUs are used to execute computational physics programs, for example (and 
deep-net learning programs, of course).

@philipthrift



@philipthrift

On Wednesday, October 2, 2019 at 6:33:23 PM UTC-5, Brent wrote:
>
> No need to wait for the future, almost all computers now have a GPU to 
> handle the screen graphics which is as powerful as the CPU and optimized to 
> be faster for some operations.
>
> Brent
>
> On 10/2/2019 9:46 AM, Lawrence Crowell wrote:
>
> It is hard to judge. I tend to suspect future computers may have an array 
> of processors. A computer might have several types of processors, One might 
> be a qubit processor, another a neural network on a hardware level, another 
> a spin-tronic processor and at the core will probably be a classical 
> von-Neumann processor. 
>
> LC
>
>
>

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Re: Quantum Computing News

['Brent Meeker' via Everything List]

No need to wait for the future, almost all computers now have a GPU to 
handle the screen graphics which is as powerful as the CPU and optimized 
to be faster for some operations.


Brent

On 10/2/2019 9:46 AM, Lawrence Crowell wrote:
It is hard to judge. I tend to suspect future computers may have an 
array of processors. A computer might have several types of 
processors, One might be a qubit processor, another a neural network 
on a hardware level, another a spin-tronic processor and at the core 
will probably be a classical von-Neumann processor.


LC


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Re: Quantum Computing News

[spudboy100 via Everything List]

That is very,...adaptable. My focus as a user of QC or photon, or bio-protein 
computing, would be the capability (perhaps imaginary), for accelerating 
technical progress. Otherwise, it's a well-funded hobby. Yes yes to encryption 
breaking of course. Maybe that is what it will ever be, just a high speed code 
breaker? 


-Original Message-
From: Lawrence Crowell 
To: Everything List 
Sent: Wed, Oct 2, 2019 12:46 pm
Subject: Re: Quantum Computing News

It is hard to judge. I tend to suspect future computers may have an array of 
processors. A computer might have several types of processors, One might be a 
qubit processor, another a neural network on a hardware level, another a 
spin-tronic processor and at the core will probably be a classical von-Neumann 
processor.
LC

On Monday, September 30, 2019 at 8:26:33 PM UTC-5, spudb...@aol.com wrote:
So quantum supremacy has been attained and QC will spank regular computing like 
a red headed step child. 


-Original Message-
From: Lawrence Crowell 
To: Everything List 
Sent: Mon, Sep 30, 2019 7:10 pm
Subject: Re: Quantum Computing News

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

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, J. Randall, M. H. Abobeih, R. C. Berrevoets, M. J. Degen, M. A. 
Bakker, M. Markham, D. J. Twitchen, T. H. Taminiau(Submitted on 6 May 2019 
(v1), 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 |
| Cite as: | arXiv:1905.02094 [quant-ph] |
|   | (or arXiv:1905.02094v2 [quant- ph] for this version) |

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Re: Quantum Computing News

[Lawrence Crowell]

It is hard to judge. I tend to suspect future computers may have an array 
of processors. A computer might have several types of processors, One might 
be a qubit processor, another a neural network on a hardware level, another 
a spin-tronic processor and at the core will probably be a classical 
von-Neumann processor.

LC

On Monday, September 30, 2019 at 8:26:33 PM UTC-5, spudb...@aol.com wrote:
>
> So quantum supremacy has been attained and QC will spank regular computing 
> like a red headed step child. 
>
>
> -Original Message-
> From: Lawrence Crowell >
> To: Everything List >
> Sent: Mon, Sep 30, 2019 7:10 pm
> Subject: Re: Quantum Computing News
>
> 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://arxi

Re: Quantum Computing News

[John Clark]

On Mon, Sep 30, 2019 at 7:10 PM Lawrence Crowell <
goldenfieldquaterni...@gmail.com> wrote:

> If they can sustain a qubit for one minute they must have a fairly robust
> quantum error correction code.
>

Not necessarily. Take a look at this article from 2013, it only involved
single isolated Qubits not 10 interlocking ones as in the more recent work
but "*the coherence time of the qubits was extended to 3 hours at cryogenic
temperatures and 39 minutes at room temperature*":

Room-Temperature Quantum Bit Storage Exceeding 39 Minutes Using Ionized
Donors in Silicon-28 

John K Clark





A 10-qubit solid-state spin register with quantum memory up to one minute
> C. E. Bradley
> 
> , J. Randall
> , M.
> H. Abobeih
> 
> , R. C. Berrevoets
> 
> , M. J. Degen
> , M.
> A. Bakker
> 
> , M. Markham
> , D.
> J. Twitchen
> 
> , T. H. Taminiau
> 
> (Submitted on 6 May 2019 (v1 ), 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
> 
> Cite as: arXiv:1905.02094  [quant-ph]
>   (or arXiv:1905.02094v2  [quant-ph] for
> this version)
>
> --
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> 
> .
>

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Re: Quantum Computing News

[Philip Thrift]

Chris Monroe [http://iontrap.umd.edu ]: "You 
can either have really clean qubits that are hard to build but you don't 
need too many of them, or you can have crappy qubits and you need a 
gazillion of them."

https://www.afr.com/technology/why-google-wasn-t-really-the-first-to-achieve-quantum-supremacy-20190927-p52vg6

@philipthrift

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 
> 
>
> John K Clark
>

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Re: Quantum Computing News

[spudboy100 via Everything List]

So quantum supremacy has been attained and QC will spank regular computing like 
a red headed step child. 


-Original Message-
From: Lawrence Crowell 
To: Everything List 
Sent: Mon, Sep 30, 2019 7:10 pm
Subject: Re: Quantum Computing News

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

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, J. Randall, M. H. Abobeih, R. C. Berrevoets, M. J. Degen, M. A. 
Bakker, M. Markham, D. J. Twitchen, T. H. Taminiau(Submitted on 6 May 2019 
(v1), 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 |
| Cite as: | arXiv:1905.02094 [quant-ph] |
|   | (or arXiv:1905.02094v2 [quant-ph] for this version) |

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Re: Quantum Computing News

[Lawrence Crowell]

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 
> 
>
> 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 
, J. 
Randall 
, M. 
H. Abobeih 
, R. 
C. Berrevoets 

, M. J. Degen 
, M. 
A. Bakker 
, M. 
Markham 
, D. 
J. Twitchen 

, T. H. Taminiau 

(Submitted on 6 May 2019 (v1 ), 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 

Cite as: arXiv:1905.02094  [quant-ph]
  (or arXiv:1905.02094v2  [quant-ph] for 
this version)

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Quantum Computing News

[John Clark]

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


John K Clark

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