A soft rain began to fall on the high, hollow roof, adding to my damp mood and the penetrating chill in the building. The warehouse was dark, except for a light in the far corner that glowed like a pale sun. I approached a low wood rail and stood in the long, curved shadow of a big black sphere, bloated and shiny, rising on tiny fins almost to the ceiling, silent but for the low hum of the power that kept it alive. A bank of heavily insulated pipes passed under the rails and through the wooden wall to dedicated generators and a refrigeration complex outside.
Early in its development, Tiflin had named the sphere Magic 8 Ball, soon shortened to 8 Ball because, as Tiflin insisted, there was nothing magical about our machine – just good solid physics. It retained a window on one side, however, like the old toy. Tiflin had asked it to be painted on after we finished the first phase.
The window’s message: Try Again Later.
Reading that again, I experienced an odd sort of dizzy spell, as if there were too many of me in one place – a symptom of stress and hard work, I presumed.
8 Ball was our third major attempt at a fully operational and manageable quantum computer. No doubt you’ve heard something about quantum computing. The underlying ideas are spooky and new, so a lot of what you’ve heard is bound to be wrong. A quantum computer works not with bits but with qubits, or quantum bits. A classic bit, like a light switch, is either on or off, one or zero. A quantum bit can be kept in superposition, neither on nor off, nor both, nor neither – like Schrödinger’s cat until you open its very special box.
Off in far corners, two other big spheres peered from the shadows: 8 Ball’s defunct siblings, Mega and Mini. Mini was ten meters across and had once contained 128 qubits. In its scavenged condition – white insulation peeling, surrounded by a tangle of pipes and wires leading nowhere – it resembled a giant golf ball. We had turned it off – killed it – three years ago. Standing in the opposite corner, Mega was eleven meters wide and resembled a moldy Florida orange. It had contained 256 qubits, all niobium or aluminum circuits bathed in liquid helium. It had sort of worked, for a time – and then it didn’t. Thumbs-down on Mega.
Filling the expanded north end of the building, 8 Ball was twelve meters in diameter and contained 1024 qubits, each a two-dimensional electron cloud clamped between plates of gallium arsenide and cooled to just a femto-fraction of a degree above absolute zero. The qubits lined the sphere’s penultimate outer layer, and each one communicated, if that’s the right word, through braided world lines across a central vacuum to an entangled twin on the other side of the sphere. Entanglement meant the paired qubits duplicated each other’s quantum state. If one was changed or measured, the other would reflect that interference, no matter how far apart they were. They would be superposed.
Each electron cloud became a new variety of matter, known as an anyon, confirmation of the existence of which we were particularly proud. The qubits’ spooky vacuum jive would, we hoped, help make 8 Ball the most stable quantum computer yet.
But despite a promising beginning, 8 Ball refused to work as designed. Sampling its output caused a catastrophic early collapse of the program strings, which themselves seemed to have been turned into useless nonsense. That had forced us to take a radically new approach. It seemed very possible that if this effort failed, 8 Ball would soon join Mega and Mini as little more than another archaeological curiosity.
Tiflin had asked me to meet him at the warehouse to help check out the newest part of our installation. I was about to stoop to look underneath the black sphere when I noticed a small yellow piece of paper stuck to the rail -- a Post-it Note. Other than me, nobody in the lab used Post-its, and I only used them in my office. I pulled up the note. Written on one side in my squared-off printing was, Don’t try to find me. I did not remember either writing this message or sticking it on the rail. Maybe I had simply forgotten. Maybe someone was messing with me and had put it there to screw with my day. There were plenty of smart-asses in our division capable of playing mind games. Work had been painfully difficult the last few weeks. Pressure on our entire team was intense.
I tried to think back and retrace my steps. Parking, walking, answering the absurdly personal questions, my little talk with Mr. Turing –
Plus the dizzy spell.
I had never written a note.
Outside the warehouse, I heard the slam of a car door, followed by feet on gravel. A key clicked in the outer lock. Tiflin entered the security cage and muttered his own answers to the cage’s questions. The inner gate opened. He seemed even more distracted than I was. As he approached 8 Ball, he patted all of his pockets – shirt, pants, leather jacket – as if he’d forgotten something.
I crumpled the Post-it into a ball and hid it in my pants pocket.
When Tiflin came within a few steps, he glanced up at me, startled, and stopped patting, head cocked like a cat considering where to lick next. He broke that off with a long wink, meant to reassure me that Dr. Hugh Tiflin was indeed still in the building, then smoothed his hands down his coat.
At forty-two, Tiflin was a slender man whose upper torso was taller than average and whose legs were shorter. His neck was pale and swanlike, with distinct cords and veins that revealed frequent changes of emotion. His head was large and well-formed, with a chiseled chin and handsome eagle nose, topped by ebullient wavy brown hair. He wore a signature quilted black leather jacket over a cotton shirt, usually green or pink – green today – tucked into cotton-duck hiking pants. His running shoes were cheap and gray. He replaced them every two or three weeks, but somehow they always looked dirty. He was eldest in our team – older than me by a year. He was a genius, of course, or I’d never have worked with him.
“Good morning, Bose. How’s the scint?” he asked.
Four weeks ago, he had decided to eavesdrop on the qubits’ secret communications using a scintillation detector scavenged from a defense division CubeSat. The detector had originally been designed to monitor radiation from orbit over Iran, North Korea, or Pakistan. Tiflin had personally tuned the device to detect disturbances in 8 Ball’s vacuum – bursts of virtual radiation provoked by the passage of our qubits’ entangled photons. New stuff, amazing stuff. Who knew that a vacuum could act like a cloud chamber in a science museum? Tiflin knew – or knew people who knew. That’s why he was Tiflin.
I stooped again to peer at 8 Ball’s lower belly. A wide concrete platform between the main supports – the fins – steadied a stainless steel tube that poked up through 8 Ball’s shell and deep into its central vacuum. “Rudely intrusive,” I said.
Tiflin chuckled. “Right up the ass. We need to wake up this beast.” He looked for himself. “Seems good,” he said, sucking on his cheeks. “Should help us track our progress.” He rose, gripped the rail with both hands, and looked on 8 Ball with pique mixed with adoration. I understood completely. I, too, regarded the black sphere with both love and dread. 8 Ball was beyond doubt the strangest human construct on Earth, and if Tiflin’s plans were all that he hinted, it was about to go through a sea change of procedure and programming.
“We’re due to meet with Cate in thirty minutes,” he said, again patting his pockets. Was he looking for his phone? A pen? A lighter? “Dieter’s got the strings ready to load. Need a ride?”
I didn’t, but the VW could wait. Tiflin and I needed time to reintegrate our states, to normalize. He sounded reasonably cheerful, but I knew the stress he was under. For a year, tough minds whose job it was to decide which funds should go where had been circling our project like sharks. They were far from convinced 8 Ball was in the division’s best interests. Other groups, however, were still making plans that assumed our success. Both were pressing hard on Tiflin.