David McKay

Quantum Physicist at IBM. Views are my own.

[Jay Gambetta @jaygambetta]

Preparing large GHZ states have long been a test of hardware capabilities. Using the IBM's Heron QPU the team recently showed that 120 logical qubits can be entangled in a GHZ state - a new world record. Work done by @AliJavadiAbhari and Simon Martiel.

[Barack Obama @BarackObama]

I often hear folks say, “Donald Trump sent me a check during the pandemic.”

I want to make sure you understand this: Congress sent you a check. By the way, Joe Biden also sent you a check during the pandemic, just like I gave people relief during the Great Recession. The difference is that we didn’t put our names on it – because it wasn’t about feeding our egos or advancing our politics, it was about helping people.

So don’t be giving him credit for that. And don’t give him your vote, either. There’s only one candidate in this election who cares about you, and that’s Kamala Harris.

[Janet Johnson @JJohnsonLaw]

Bravo, ⁦@nytimes⁩ 👏🏼

[Antonio Mezzacapo @A_Mezzacapo]

Realistic modeling of quantum chemistry was historically believed to require phase estimation and fault-tolerant quantum computers.

Today's work led by Kennie Merz's team at @ClevelandClinic shows that we can model water and methane dimers with quantum-centric approach.

[Gregory White @gregswhitenoise]

To cap off the day we have Alireza Seif with entanglement-enhanced learning of quantum processes #APQC2024

[Gregory White @gregswhitenoise]

And now for Kristian Temme to talk about IBM’s quantum utility paper! #APQC2024

[Gregory White @gregswhitenoise]

Coming from IBM’s suite of giant devices David McKay’s question is how do we benchmark hardware and software at scale? #APQC2024

[Gregory White @gregswhitenoise]

Seth Merkel now contends that Clifford circuits are all you need to benchmark #APQC2024

[David McKay @qubitsRcool]

@gregswhitenoise doing a great job tweeting APQC, but he's talking now, so I'll tweet for him. Greg telling us about characterizing non-markovian noise.

[Ken Wei @phase_sm1th]

@EmilyPritchet18 @qubitsRcool @AliJavadiAbhari published! https://t.co/wm2dq67Oez

[Alexandre Blais @circuitqed]

Having a great time with the participants of the 7th edition of the Quantum Cavities Workshop! Many thanks to our sponsors @NordQuantique @Zhinst @IQ_USherbrooke @GouvQc

[David McKay @qubitsRcool]

Great workshop! Thanks @circuitqed and @IQ_USherbrooke

[Andreas Wallraff @AndreasAtETH]

Having a great time with colleagues and friends at the #Quantum Cavities 2024 workshop in Jouvence near Sherbrooke, Canada.
Great talks and discussions with participants from @Yale_QI @IQ_USherbrooke @UChicagoPME and many other institutions.
Do you recognize anyone on the conference photo we took yesterday?
Also, the full program is available here: https://t.co/GpoaX1dADY

[Jay Gambetta @jaygambetta]

Check out this new paper where IBM teamed up with researchers from RIKEN and the University of Colorado to perform the first demonstration of quanutm-centric supercomputing using both the Heron processor and the supercomputer Fugaku.

[David McKay @qubitsRcool]

@cbaldwin4 "While it is not clear what can be done to fix the algorithmic qubits test, it is already clear that it is much easier to pass than QV and is a poor substitute for measuring performance."

[David McKay @qubitsRcool]

Really nice rebuttal of algorithmic qubits by @cbaldwin4 https://t.co/OKOlIYntdS

[David McKay @qubitsRcool]

@IonQ_Inc (echoing @JohriSonika 's sentiment). Also this quote from the press release "At #AQ 35, IonQ Forte is capable of considering more than 34 billion different possibilities simultaneously" is not backed by evidence or even a proper description of how quantum algorithms operate.

[David McKay @qubitsRcool]

@IonQ_Inc It's disingenuous to imply that one could successfully execute a monte carlo circuit with 35 qubits and 1000 gates when in reality the circuit that was used in the protocol was 7 qubits and 26 gates. It's very misleading to report gate count BEFORE heavy compiler optimization.

[Jay Gambetta @jaygambetta]

oh this is awesome. https://t.co/74ZnUMjZzq

[David McKay @qubitsRcool]

@sar_shel You're calibrating so fast your hand is blurry

[John A Gunnels @jagunnels]

You can start out using just one device, but graduate to the two-handed, "Bloch-sphere configuration," (^/v) as your mind superimposes the colors and entangles the sounds (or the other way around ... in reverse). At 2^$ the price (that's how quantum works), it's a steal. https://t.co/XXfvdgefMh