Monday, December 6, 2021

World War 2 History: Pictures from Warsaw Uprising of 1944


The truth Hitler tried to hide: Extraordinary never-before-seen photos taken by a German soldier capture weary and unkempt Nazis fighting in the Warsaw Uprising

  • The photographs were taken between September 2-13, 1944 in the Polish capital during the Warsaw Uprising
  • Nazi soldiers look dishevelled an unkempt as they continue to battle the Poles who took up arms against them
  • The Warsaw Uprising saw around 50,000 young Poles revolt against the Nazis despite being poorly armed
  • The 63-day battle broke out on August 1, 1944, and saw 18,000 insurgents killed and another 25,000 injured
  • Images showing beleaguered Nazis looking tired and worn out would not have been published at the time
  • Photographs of German soldiers looking weak could have crippled the Nazi propaganda machine

Extraordinary never-before-seen photographs taken by a German soldier during WWII have gone on show for the first time after being rescued from an online auction.

The set of 59 black and white private photos taken between September 2-13, 1944, shows German soldiers during the Warsaw Uprising, the largest resistance insurgence against Nazis forces during the whole war.

Such photos taken on the frontline of beleaguered Nazi soldiers would never have been published at the time, as they could have proved damaging to the efforts of the Nazi propaganda machine. 

The Warsaw Uprising, which began on 1 August 1944 and lasted until 2 October 1944, resulted in Hitler ordering the complete destruction of the city.

By the time his Nazi forces had finished, more than 80 percent of the city had been razed to the ground, and around 18,000 Poles had lost their lives in the 63-day battle. 

Jan Ołdakowski, the director of the Warsaw Rising Museum said: 'These photos were taken from a private perspective, which is why they are so valuable.'

Shabbily-dressed German officers are seen giving Nazi salutes to a group of women, some of whom are returning the gesture. It is not clear if the women are German or local Polish civilians trying to save their own lives.

Shabbily-dressed German officers are seen giving Nazi salutes to a group of women, some of whom are returning the gesture. It is not clear if the women are German or local Polish civilians trying to save their own lives.

A group of scruffily-dressed Nazi officers at the graveside of a comrade killed during fighting. Around 18,000 Polish insurgents were slaughtered by the well-armed Germans.

A group of scruffily-dressed Nazi officers at the graveside of a comrade killed during fighting. Around 18,000 Polish insurgents were slaughtered by the well-armed Germans.

Shabbily-dressed German soldiers spy through a peephole as they lie holed up in what appears to be an evacuated apartment. The soldiers appear to have been lying on filthy blankets and are hiding from the enemy - such images would never have been published in Nazi Germany.

Shabbily-dressed German soldiers spy through a peephole as they lie holed up in what appears to be an evacuated apartment. The soldiers appear to have been lying on filthy blankets and are hiding from the enemy - such images would never have been published in Nazi Germany.

German soldiers inspect the aftermath of an explosion on a train track which blew several holes in the ground and split the wrought iron tracks in two.

German soldiers inspect the aftermath of an explosion on a train track which blew several holes in the ground and split the wrought iron tracks in two.

Ołdakowski continuedL ‘You can see that the recommendations on how to photograph German soldiers did not apply to them, so they are often sloppy, dirty and sitting in postures that would not please their bosses.’

He added: ‘A German soldier could not show in his photos another German soldier who had his uniform unbuttoned, or who was tired.

‘The Germans made sure that the image of their soldiers was that of a victorious, well-uniformed, decent army.’

Soldiers file out of a building carrying their weapons. The fighters look tired and worn - a far cry from the master race of elite fighting forces portrayed in Nazi propaganda

Soldiers file out of a building carrying their weapons. The fighters look tired and worn - a far cry from the master race of elite fighting forces portrayed in Nazi propaganda

Shirtless and dishevelled soldiers lift destroyed equipment onto a train in the aftermath of heavy fighting in the Polish capital

Shirtless and dishevelled soldiers lift destroyed equipment onto a train in the aftermath of heavy fighting in the Polish capital

Nazi soldiers peek out of the window of an apartment in Warsaw that has been boarded up amid the bitter fighting

Nazi soldiers peek out of the window of an apartment in Warsaw that has been boarded up amid the bitter fighting

German soldiers stand alongside heavy artillery directed at the city as they await orders from their superiors

German soldiers stand alongside heavy artillery directed at the city as they await orders from their superiors 

The unique photos described by historians as ‘historically priceless’ were recently discovered by staff at the Warsaw Rising Museum after being put up for sale on an internet auction site.

The owner, an antiquarian bookseller in the Czech Republic, agreed to sell them to the museum for the equivalent of £2,000 if he received the money within 48 hours.

Now on public display online, other photos show the occupying Nazi German soldiers manning positions in buildings, preparing to face the onslaught from Stalin’s Red Army waiting on the other side of the Vistula river, and Wehrmacht troops on patrol on the bombed out capital’s streets.

German troops ride atop an armoured vehicle making its way through the streets of the demolished Polish capital

German troops ride atop an armoured vehicle making its way through the streets of the demolished Polish capital

A Nazi officer oversees what appear to be local civilians who have been rounded up and put to work for the German soldiers

A Nazi officer oversees what appear to be local civilians who have been rounded up and put to work for the German soldiers

In one, shabbily-dressed German officers are seen giving Nazi salutes to a group of women, some of whom are returning the gesture.

It is not known if the women are German or local civilians hoping to save their own lives.

Another shows a group of scruffily-dressed officers at the graveside of a comrade killed during fighting.

Yet another shows dishevelled officers from the German railway security service (Bahnschutz) filing through a homemade bunker with overhead street barricades.

The bitter fighting lasted for 63 days and resulted in the majority of the city being utterly destroyed by German heavy artillery after Hitler ordered its destruction

The bitter fighting lasted for 63 days and resulted in the majority of the city being utterly destroyed by German heavy artillery after Hitler ordered its destruction

Many more show German officers inspecting damage to railway tracks.

The collection ends with photos of Polish civilians being herded out of the capital’s Ochota district.

Although the identity of the soldier who took the photos remains a mystery, historian Ryszard Mączewski said: ‘It could have been a soldier of the 302nd Radio Battalion, because the weapons used by soldiers from that unit are visible in the photographs.

‘However, it could also have been someone connected with the Bahnschutz, as officers of German railways can be seen in the photographs.’ 

This photo depicts a group of Polish civilians who did not form part of the insurgency against the Nazis being herded out of the capital’s Ochota district

This photo depicts a group of Polish civilians who did not form part of the insurgency against the Nazis being herded out of the capital’s Ochota district

Around 18,000 Poles lost their lives in the 63-day battle, with another 25,000 injured

Around 18,000 Poles lost their lives in the 63-day battle, with another 25,000 injured

The Warsaw Uprising, which began on 1 August 1944 and lasted until 2 October 1944, resulted in Hitler ordering the complete destruction of the city. By the time his Nazi forces had finished, over 80 percent of the city had been razed to the ground.

The Warsaw Uprising, which began on 1 August 1944 and lasted until 2 October 1944, resulted in Hitler ordering the complete destruction of the city. By the time his Nazi forces had finished, over 80 percent of the city had been razed to the ground.

WHAT HAPPENED DURING THE WARSAW UPRISING?

The Warsaw Uprising saw an estimated 50,000 young Polish men and women take up arms against the Nazis occupying the city.

The insurgents, known as the Home Army, were aiming to oust the Germans and take control of Warsaw before it was ‘liberated’ by the advancing Soviet Army. It was expected to take only a few days, but lasted two months.

The bloody 63-day battle, which broke out on August 1, 1944, saw some 18,000 of the insurgents killed and another 25,000 injured in the struggle against the well-armed Germans.

Commanded by General Tadeusz Bór-Komorowski, the Home Army had managed to gain control of most of Warsaw within three days.

But the Germans sent in reinforcements and forced the insurgents into a defensive position by bombarding them with artillery and air attacks over the course of two months.

Without Allied support, the Home Army was split into small and disconnected units and was forced to surrender when its supplies ran out on October 2.

By the time the uprising ended, some 180,000 civilians had also been killed in German bombings and executions.

General Bór-Komorowski and his forces were taken as prisoners and the Nazis then razed the city. They also expelled around 500,000 remaining residents, sending some to the Auschwitz death camp.

The revolt held up the westward advance of the Soviet Red Army, which waited across the Vistula River for its end.

Despite the Home Army's resistance to the German enemy, Soviet forces under the command of Josef Stalin were ordered to hang back and allow the Germans to crush the uprising.

This meant that pro-communist Polish leaders, who were in exile in London, would face no resistance when they returned to Soviet-occupied Poland.   

The Warsaw Uprising was the second major show of resistance against the Nazis in Poland - in April 19, 1943, the Warsaw 'ghetto uprising' began after German troops and police entered the ghetto to deport its surviving inhabitants.

Jewish insurgents inside the ghetto resisted these efforts, and manifested the largest uprising by Jews during the World War and the first significant urban revolt against German occupation in Europe. 

By May 16, 1943, the Germans had crushed the uprising and deported surviving ghetto residents to concentration camps and killing centres.

Sunday, December 5, 2021

Science News: Researchers create 'time crystal' with quantum computers

 

Researchers create 'time crystal' with quantum computers


The versatility of quantum computers have helped physicists create a "time crystal," a new phase of matter.


Researchers have successfully created a "time crystal," a new phase of matter, with the help of a quantum computer, according to a new study published in the peer-reviewed journal Nature on Tuesday.

A time crystal, first proposed by physicist Frank Wilczek in 2012, is a phase of matter which repeats in time, similar to how a regular crystal's structure repeats in space. What that means is that the particles in the crystal perpetually switch between two states without requiring the input of more energy and without losing any energy.

These crystals are the first objects to break what is known as "time-translation symmetry," a rule in physics that says that a stable object will remain unchanged throughout time. Time crystals avoid this rule, being both stable and ever-changing.

So, for example, ice when stable will remain ice and will only change when temperature or another factor makes it unstable. A time crystal would change even when in its ground state, acting differently than all other phases of matter.

But scientists still needed to figure out how to create this phase of matter. They turned to a phenomenon called many-body localization.

Many-body-localization is when a one-dimensional chain of quantum particles gets stuck in a fixed state. Each particle in the chain has a magnetic orientation (known as "spin") that points up, down, or a certain probability of both directions, according to Quanta Magazine

For example, imagine the particles are set up so that the first one points up, the next one points down, the one after that points down and the one after that points up. Usually, the spins would quantum mechanically fluctuate and align, if possible. But with random interference between the particles confining their activity, the row of particles can get stuck in a particular configuration, unable to rearrange or settle into thermal equilibrium. They'll point in that configuration indefinitely.

In 2014, Vedika Khemani, a condensed matter physicist who is now at Stanford, and Shivaji Sondhi who was her doctoral advisor at Princeton at the time, found that many-body localized systems could exhibit a special kind of order: if all of the spins in the system were flipped, it would be another stable, many-body localized state, according to Quanta Magazine.

What this means is that if the system were to be prodded with a laser, it would forever cycle between the two states without absorbing or releasing energy from the laser.

Khemani and Sondhi, together with Achilleas Lazarides and Roderich Moessner at the Max Planck Institute for Physics of Complex Systems, were able to find such a system where the spins of the particles flipped between patterns that repeated forever, at a period twice that of the period of the laser.

This system is unique because it is a system of millions of things that oscillate between two states, only completing a cycle when prodded twice by the laser, and doing so without absorbing or releasing energy.

An article on Stanford's website stressed that while this may sound like a "perpetual motion machine," which would break the laws of physics by allowing perpetual motion without any external energy source, this is not the case.

Entropy - a measure of the disorder in the system - remains stationary, not increasing, but not decreasing either, which means it still fits into the second law of thermodynamics which rules that disorder cannot decrease, but allows for the disorder to remain at a constant level as long as the process is reversible.

An example of a reversible process is a gas flowing through a pipe that is tight in the middle. As the flow moves through the constricted part of the pipe, its pressure, temperature and velocity change, but these values return to their original conditions after they enter the widened part of the pipe, meaning that the change in entropy is zero.

While other attempts have gotten close to making a time crystal, the crystal described in the study published in Nature is the first to meet all the requirements needed to make a truly infinitely stable time crystal.

The access to Google’s Sycamore quantum computing hardware was what allowed the researchers to make their breakthrough.

Although the hardware is still imperfect, meaning that the experiment was still limited in size and duration, the researchers created a number of protocols that allowed them to assess the stability of the time crystal, including running the simulation forward and backward in time and scaling the size.

“We managed to use the versatility of the quantum computer to help us analyze its own limitations,” said Roderich Moessner, co-author of the paper and director at the Max Planck Institute for Physics of Complex Systems. “It essentially told us how to correct for its own errors, so that the fingerprint of ideal time-crystalline behavior could be ascertained from finite time observations.”

The researchers used a chip with 20 qubits - controllable quantum particles which maintain two possible states, 0 and 1, at the same time - made out of superconducting aluminum strips, according to Quanta Magazine. The states were programmed to represent up or down spins.

The programmers were able to randomize the interaction strengths of the qubits, creating the interference needed to lock the particles into a set pattern of spins instead of letting them align.

The researchers tested a large number of initial configurations to see if they could all be locked into an eternally oscillating pattern of spins which would oscillate at twice the period of the prodding, probing over a million states in just a single run of the machine.

They were also able to extrapolate trends from the relatively small systems that could be created on the Sycamore hardware to much large systems. The researchers were also able to show that, except for decoherence in the processor itself, there was no increasing entropy in the simulated system itself.

All of these findings together substantially bolstered the case for the existence of time crystals more so than past experiments were able to.

“I am optimistic that with more and better qubits, our approach can become the main method in studying non-equilibrium dynamics,” said Pedram Roushan, a researcher at Google and senior author of the paper.

“We think that the most exciting use for quantum computers right now is as platforms for fundamental quantum physics,” said Matteo Ippoliti, a postdoctoral scholar at Stanford and co-lead author of the work. “With the unique capabilities of these systems, there’s hope that you might discover some new phenomenon that you hadn’t predicted.”

On Saturday, another team at QuTech, a collaboration between the Delft University of Technology and the Netherlands Organisation for Applied Scientific Research (TNO), published their findings on a time crystal they had created with a quantum processor which lasted about eight seconds.

“While a perfectly isolated time crystal can, in principle, live forever, any real experimental implementation will decay due to interactions with the environment,” said Joe Randall on QuTech's website. “Further extending the lifetime is the next frontier.”

The QuTech team used nine quantum bits and manipulated them to lock their spins into a periodically inverting pattern which formed from a variety of different initial states.

The team referred to the research conducted on the Google Sycamore quantum computer, with Tim Taminiau, lead investigator at QuTech, saying that "It is extremely exciting that multiple experimental breakthroughs are happening simultaneously.

"All these different platforms complement each other. The Google experiment uses two times more qubits, our time crystal lives about ten times longer," said Taminiau.



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